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No display on PC. but pc is powered on....

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October 17, 2011 9:30:52 AM

My pc was running great. but when i ran it after 4-6mnths there has no display :cry:  . I have checked everything..........

1. I cleaned the ram with rubber but still no work. i checked the ram on a other pc and the ram is perfectly running.
2. I checked a power cable with multimeter, and there has 5v and 12v.
3. I cleared the Bios memory.
4. I checked without ram, HDD, optical drives. without ram it was beeping.
5. I have no video card. I just using motherboard GPU.
6. Monitor is perfectly working on a other PC with the same VGA cable.
:cry: 
I did all the above. But still no success :??:  . please help me guys....................

Advanced thanks............ :sarcastic: 

More about : display powered

October 17, 2011 9:36:05 AM

your motherboard needs to be replaced :D 
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October 17, 2011 10:43:20 AM

Did you try buying a NEW OC?
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October 17, 2011 4:54:41 PM

I had a similar problem when i installed a new cooler. I did everything you did and it still didnt work. Basically what you should try is resitting the cpu, looking fot any bent pins or if it is burnt out. I resat mine and it worked fine after.
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a b B Homebuilt system
October 17, 2011 5:40:40 PM

What MB.
Did you reseat the 20/24 pin MB connector and the 4/8 pin ATX MB connector.

I would (1) install one stick of ram, disconnect all HDDs/DVD drives and retry.
You indicated you had 5/12V, where they good, ie above min stecs (4.75 V and 11.4 V)

Still no video, sounds like time for a new MB.
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October 17, 2011 5:48:36 PM

@jayadratha - try to replace the battery on the motherboard.
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October 17, 2011 5:55:40 PM

Oh yeah try resetting cmos... Like surfer said take the bat out for 10secs and replace.
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October 17, 2011 8:15:17 PM

FunSurfer said:
@jayadratha - try to replace the battery on the motherboard.


i cleared the bios already friend. still not work.....
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October 18, 2011 8:49:52 AM

jayadratha said:
i cleared the bios already friend. still not work.....


I meant check that the battery is not depleted.
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Best solution

a c 122 B Homebuilt system
October 18, 2011 9:34:30 AM

When you are asking for help, always start off with the system specifications.

When you check the PSU, you needto check more than just the 5 and 12 volt outputs (more on that later).

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.

===> Skip the complete system disassembly. You probably do not have a case problem. But do disconnect and remove everything from the motherboard except the two power cables (24 pin main power and 4/8 pin CPU power), CPU and heatsink/fan, and the case speaker.

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 (standby power supply): 5 volts always on. The green wire should also have 5 volts on it. It should go to 0 volts when you press the case power button, then back to 5 volts when you release the case power switch. 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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October 18, 2011 2:48:55 PM

jsc said:
When you are asking for help, always start off with the system specifications.

When you check the PSU, you needto check more than just the 5 and 12 volt outputs (more on that later).

The following is an expansion of my troubleshooting tips in the breadboarding link in the "Cannot boot" thread. .


Hi,
But what if the System boot properly until the Windows Log In point, then the Monitor turns off?
This can only be cause by the PSU or GPU, yes?


Rgds,
Daniel

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a b B Homebuilt system
October 18, 2011 3:17:31 PM

Generally, if you can get to the log in screen and it "dies", it is more often a HDD/Windows installation/memory problem.
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October 29, 2011 1:53:26 AM

Best answer selected by jayadratha.
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