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No monitor

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January 10, 2012 4:04:11 PM

i my friend said he knew what he was doing he lied, put new psu in and monitor wont work on a compaq presario out of work and need this baby to search i dont know what bios are im pretty comp illiterate any help for the helpless

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a b C Monitor
January 10, 2012 4:31:42 PM

What model of Presario are you using? Also, what make/model of PSU did your "friend" install?
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a b C Monitor
January 10, 2012 4:40:15 PM

:hello:  Welcome to forums.

I am guessing that your friend when faced with a broken computer went with the odds and blindly replaced the PSU (that really is the usual solution) and either the new PSU doesn't work in the computer or something else is wrong.

Along with the make/model of the replacement PSU, what is the size/capacity of the original?

For some troubleshooting ideas other than blindly replacing parts:


Work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.
http://www.tomshardware.com/forum/261145-31-read-postin...

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps, LED's, or fan activity:

Check for line power at the PSU input. Extension cords, power strips, and power cords do fail.

If you have power and no beeps, suspect components in likely order are PSU, motherboard, and CPU.

Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.
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Related resources
January 10, 2012 5:27:20 PM

COLGeek said:
What model of Presario are you using? Also, what make/model of PSU did your "friend" install?

Its a sr1920nx
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January 10, 2012 5:32:30 PM

jsc said:
:hello:  Welcome to forums.

I am guessing that your friend when faced with a broken computer went with the odds and blindly replaced the PSU (that really is the usual solution) and either the new PSU doesn't work in the computer or something else is wrong.

Along with the make/model of the replacement PSU, what is the size/capacity of the original?

For some troubleshooting ideas other than blindly replacing parts:


Work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/261145-31-read-postin...
I mean work through, not just read over it. We spent a lot of time on this. It should find most of the problems.

If not, continue.
The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread.
http://www.tomshardware.com/forum/261145-31-read-postin...

I have tested the following beep patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different, but they all use a single short beep for a successful POST.

Breadboard - that will help isolate any kind of case problem you might have.
http://www.tomshardware.com/forum/262730-31-breadboardi...

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU.

Make sure you plug the CPU power cable in. The system will not boot without it.

I always breadboard a new build. It takes only a few minutes, and you know you are putting good parts in the case once you are finished.

You can turn on the PC by momentarily shorting the two pins that the case power switch goes to. You should hear a series of long, single beeps indicating memory problems. Silence indicates a problem with (in most likely order) the PSU, motherboard, or CPU. Remember, at this time, you do not have a graphics card installed so the load on your PSU will be reduced.

If no beeps, LED's, or fan activity:

Check for line power at the PSU input. Extension cords, power strips, and power cords do fail.

If you have power and no beeps, suspect components in likely order are PSU, motherboard, and CPU.

Running fans and drives and motherboard LED's do not necessarily indicate a good PSU. In the absence of a single short beep, they also do not indicate that the system is booting.

At this point, you can sort of check the PSU. Try to borrow a known good PSU of around 550 - 600 watts. That will power just about any system with a single GPU. If you cannot do that, use a DMM to measure the voltages. Measure between the colored wires and either chassis ground or the black wires. Yellow wires should be 12 volts. Red wires: +5 volts, orange wires: +3.3 volts, blue wire : -12 volts, violet wire: 5 volts always on. Tolerances are +/- 5% except for the -12 volts which is +/- 10%.

The gray wire is really important. It should go from 0 to +5 volts when you turn the PSU on with the case switch. CPU needs this signal to boot.

You can turn on the PSU by completely disconnecting the PSU and using a paperclip or jumper wire to short the green wire to one of the neighboring black wires.
http://www.youtube.com/watch?v=5FWXgQSokF4&feature=yout...

A way that might be easier is to use the main power plug. Working from the back of the plug where the wires come out, use a bare paperclip to short between the green wire and one of the neighboring black wires. That will do the same thing with an installed PSU. It is also an easy way to bypass a questionable case power switch.

This checks the PSU under no load conditions, so it is not completely reliable. But if it can not pass this, it is dead. Then repeat the checks with the PSU plugged into the computer to put a load on the PSU.

If the system beeps:
If it looks like the PSU is good, install a memory stick. Boot. Beep pattern should change to one long and several short beeps indicating a missing graphics card.

Silence, long single beeps, or series of short beeps indicate a problem with the memory. If you get short beeps verify that the memory is in the appropriate motherboard slots.

Insert the video card and connect any necessary PCIe power connectors. Boot. At this point, the system should POST successfully (a single short beep). Notice that you do not need keyboard, mouse, monitor, or drives to successfully POST.
At this point, if the system doesn't work, it's either the video card or an inadequate PSU. Or rarely - the motherboard's PCIe interface.

Now start connecting the rest of the devices starting with the monitor, then keyboard and mouse, then the rest of the devices, testing after each step. It's possible that you can pass the POST with a defective video card. The POST routines can only check the video interface. It cannot check the internal parts of the video card.

the computer deos start now but im not sure ifevery thing is hooked up right or not and he took the what i think the cpu apart and back together it seems to start just no pic , I dont know what bios are or most the other things mentioned and have no speaker in his unit
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January 10, 2012 5:35:37 PM

the origanal unit was a atx 300 watt bestec and the new is a antec 350 watt atx
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a b C Monitor
January 11, 2012 12:06:32 AM

Are both the 4-pin and 24-pin connectors attached to the motherboard?
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January 12, 2012 8:15:21 PM

Dumb question, but is the monitor plugged into the wall and the computer? I mean, I just have to ask, because this has happened before...

Customer calls up, angry as hell.

Customer: I get no picture on the monitor, what the hell kind of service you guys running?!
Me: Is it plugged in?
Customer: Do I look like an idiot, of course its plugged in!
Me: To the computer?
Customer: Wait, it has to be plugged into the computer? How the hell do I do that?!
Me: *sigh*
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January 13, 2012 5:29:43 PM

phyco126 said:
Dumb question, but is the monitor plugged into the wall and the computer? I mean, I just have to ask, because this has happened before...

Customer calls up, angry as hell.

Customer: I get no picture on the monitor, what the hell kind of service you guys running?!
Me: Is it plugged in?
Customer: Do I look like an idiot, of course its plugged in!
Me: To the computer?
Customer: Wait, it has to be plugged into the computer? How the hell do I do that?!
Me: *sigh*


Haha that is funny.
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a b C Monitor
January 13, 2012 8:37:47 PM

phyco126 said:
Dumb question, but is the monitor plugged into the wall and the computer? I mean, I just have to ask, because this has happened before...

Customer calls up, angry as hell.

Customer: I get no picture on the monitor, what the hell kind of service you guys running?!
Me: Is it plugged in?
Customer: Do I look like an idiot, of course its plugged in!
Me: To the computer?
Customer: Wait, it has to be plugged into the computer? How the hell do I do that?!
Me: *sigh*

Once while I was half way around the world, my wife called me for computer help. She had bought a new laser printer and couldn't set it up. For me it was the middle of the night, for her it was daytime. After 2 hours on the phone, I was at wits end and then I asked...."Did you turn on the printer?".....the line went dead (so I thought).

A few moments later she exclaimed, "The directions never said to do that!!!" I then heard the PC chime in the background indicating that it had recognized the device. I then trudged off back to my cot.
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January 13, 2012 9:10:37 PM

Those are really funny stories lol.
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!