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No mouse/key or video

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  • Homebuilt
  • CPUs
  • Systems
Last response: in Systems
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October 30, 2010 8:34:25 PM

Hi,

CPU- Intel core 2 duo 6600 sl9sb 2.4ghz
Motherboard - Intel Desktop Board DG965WH
RAM - Crucial 2GB 240PIN DDR2 DIMM (BL1117P.2T)
CPU cooler - Thermaltake A4021 92mm CPU Cooler
Video Card - NVidia GeForce 7600GT
Audio Card - Soundblaster XIFI SB0460
PSU - ULTRA II 550W
OS - Windows 7
Case - SilverStone LC18


My PC no longer posts (or at least it seems), i see no video and keyboard/mouse no longer light up at power up. The hard drive spins, the DVD opens and the fans for the PC and the CPU are spinning. Also, the lights on the MoBo are lit up.

The PC has a video display in the front and i receive "no input display" and when i try the nvidia card or the on board it fails.

The steps I have taken to resolve this myself:
1. power off the front display from the motherboard
2. remove soundblaster card
3. remove nvidia card
4. remove power to the dvd player
5. tried the on-board video
6. CMOS reset
7. tried the on-board video
8. remove RAM and replace
9. remove all parts and replace (except CPU/FAN)
10. I have tried the nvidia and the soundblaster in a separate PC and they function correctly.
11. I have also read through the "System won't boot" and "no video output" checklist - http://www.tomshardware.com/forum/261145-31-perform-ste...

Looking how i can diagnose further on if its the CPU, MoBo, RAM?

really appreciate all the help. It's been a while since i did this.

[EDIT] Forgot to actually search the Tom site first :non: 
I found this link which talks about the board i have and the current issue I'm facing...Whatya know, im within the 3year warranty. Once i diagnose if its the MOBO i'll let everyone know... http://www.tomshardware.com/forum/237658-30-intel-dg965...

[CONCLUSION]
I followed the advice of the warranty thread above and received my replacement board. Popped it in and everything is working again!
Thanks again for the help in figuring this out.

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a c 113 B Homebuilt system
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October 30, 2010 9:20:56 PM

What an excellent post. Many people could learn from this :) 

You have done all the obvious things.

I have three guesses.

Bad monitor or VGA cable. The POST could hang as a result.

Bad PSU. Supplying power but not stable enough so PC locks. Bad AC power is also a possibility maybe but that's not too likely.

Bad motherboard.

I would look for a small motherboard speaker to see if you can get some beeps. I think there's one linked in one of my posts....
http://www.cwc-group.com/casp.html
There ya go.



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a c 122 B Homebuilt system
a c 172 à CPUs
October 31, 2010 11:12:46 AM

Work 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.

OK, you did that.

If not, continue.

I have tested the following beeps patterns on Gigabyte, eVGA, and ECS motherboards. Other BIOS' may be different.

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

The following is an expansion of my breadboarding thread.

Breadboard with just motherboard, CPU & HSF, case speaker, and PSU. You do have a case speaker installed, right? If not, you really, really need one. If your case or motherboard didn't come with a system speaker, you can buy one here:
http://www.cwc-group.com/casp.html

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:
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...

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 or long single beeps indicate a problem with the memory.

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.

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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November 7, 2010 12:09:06 PM

Best answer selected by idocg.
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