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No monitor output, no beep (no post)

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March 18, 2011 7:25:41 PM

Fans on, everything sounds normal except no familiar beep when the computer turns on. Screen still has no output.

I turned on my computer this morning and it didn't post. I didn't do anything that could've caused this to the best of my knowledge.

I had this problem on the 14th, last week, but I just jumpered my RTC RAM and it allowed me to post, I think because it reset BIOS settings to defaults. It worked fine and I did that today to no avail.

I've had occasional BSODs from USB Drivers or whatever but those seem to be unrelated at the moment and I'm not concerned about them as they never occured inside Windows.


phenom ii 955 @ stock
gskill 2x2gb running at 1600 @ 9-9-9-24 @ 1.5v
m4a77td
his 5850 @ stock
samsung hd322gj
ocz stealthxstream ii 600w
ssd ocz vertex 30gb
windows 7 x64 professional
elite 430 with 4 fans.

wireless adapter, keyboard, mouse, printer plugged into usbs.


Thanks for your help in advance!



*PS
I've removed my graphics card so I could remove the CMOS battery and I did for 5 minutes and replaced it and no post still. Just fans turn on and no indication of any progress.

QUESTION: I should still hear the computer speaker beep even without my graphics card plugged into the mobo right? I won't be able to see anything obviously since I don't have onboard graphics but I should hear it post, correct?

More about : monitor output beep post

a b B Homebuilt system
March 19, 2011 12:33:10 PM

I saw this posted on another THW thread. I guess i should have gotten the originators name when I copied it. (PS if you read this a its yours, please take credit for this great guide)

here is the advice that was given:

Work systematically through our standard checklist and troubleshooting thread:
http://www.tomshardware.com/forum/ [...] t-problems
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.

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/ [...] adboarding

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:
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=5FW [...] tube_gdata

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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a c 122 B Homebuilt system
March 20, 2011 12:07:28 AM

Hi, jerreddredd.

The guide is mine. The problem with copying a reply like this is that the links do not copy properly and you lose a lot of the formatting.

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.

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:
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.

See the difference?
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Related resources
March 20, 2011 12:17:26 AM

It's fixed! Before you guys replied but I did look those threads...

What I did:

Took out GPU of PCI x16 slot.
Took out battery.
Tried and it still didn't work.

Took out battery for longer amount of time again... like 30-60 minutes.
Took out both ram sticks, it beep errored.
Put in one.

In my head said screw it, put in battery & GPU, still one stick.
IT BOOTS!

This is kind of mysterious... but it's been working.

If this happens in the future what do you guys think the problem is that causes a need to intermittently keep resetting the bios which apparently fixes the issue?
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a b B Homebuilt system
March 20, 2011 5:49:37 AM

jsc said:
Hi, jerreddredd.

The guide is mine. The problem with copying a reply like this is that the links do not copy properly and you lose a lot of the formatting.

See the difference?


Yes, Great Guide Jsc, If I use it again (with your permission) I will try harder to get the formatting a links right or just use a link back to one of your posts. I will most definitely credit you with it. I want to give credit where credit is due.

I originally copy/pasted it into Word just for my own use so that I would have a systematic way of troubleshooting my builds, instead of my haphazard way I go about it now.

Again great guide!

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a b B Homebuilt system
March 20, 2011 5:55:16 AM

flashfir said:
It's fixed! Before you guys replied but I did look those threads...

What I did:

Took out GPU of PCI x16 slot.
Took out battery.
Tried and it still didn't work.

Took out battery for longer amount of time again... like 30-60 minutes.
Took out both ram sticks, it beep errored.
Put in one.

In my head said screw it, put in battery & GPU, still one stick.
IT BOOTS!

This is kind of mysterious... but it's been working.

If this happens in the future what do you guys think the problem is that causes a need to intermittently keep resetting the bios which apparently fixes the issue?


Not sure. next time I wouldn't reset the bios and follow the guide and see what component the MB doesn't like.
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!