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PC troubles,

post #1 of 5
Thread Starter 
Alright, so my Dad and I fix computers as a little side-job and just recently an old friend from school brought his computer over (as well as his old motherboard.) His complaint was that it turned on okay, but his monitor said 'NO SIGNAL' so I automatically assumed it was a video card problem.

Upon closer inspection, I noticed that the 6-pin 12V connector to power the video card wasn't plugged in. So I plugged it in and powered the computer up; Nothing. Still no signal coming from the system. My dad suggested that I remove the motherboard from the tower and just try to run it off the bench, so I did just that: removed the power supply, disconnected the hard drives, etc. With the unit sitting on the bench, I then re-wired the power supply and installed the video card. Again when I powered it up, I didn't get a signal. However we noticed that not only weren't we getting a video signal, but the hard-drive wasn't spinning as it normally should when a computer boots up.

We tried swapping out the RAM, and we've tried another video card on that motherboard only to get the same results.

So with no idea as to what's happening, we swapped out the motherboards and retried it from the beginning. Different motherboard / processor, different RAM, two different video cards, as well as two different power supplies... we can't get either boards to POST or even show anything on the screen.

I'm here to ask if anyone has had similar experiences with their (or someone elses') computer. Hopefully someone can shed some light on this puzzle for us.

Systems:
Asus A8N-SLI Skt. 939 Motherboard w/ AMD Athlon 3800
512Mb DDR RAM

Foxconn M-ATX motherboard /w unknown CPU
512Mb DDR RAM

Hardware that we've swapped between the two to try to get them working:
eVGA 7800GTX
eVGA 8800GT
misc. DDR RAM modules
550W generic brand PSU
680W Apevia PSU
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 @ 2.4Ghz eVGA 680i SE eVGA 8800GT 4Gb OCZ Platinum DDR2 
Hard DriveOSMonitorKeyboard
1x 80Gb Western Digital, 1x 250Gb Western Digital Windows 7 Professional x64 Sceptre X9 Gamer 19' LCD Razer Arctosa 
PowerCaseMouse
Cooler Master 700W Silent Pro Cooler Master HAF 932 Razer Diamondback 3G 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 @ 2.4Ghz eVGA 680i SE eVGA 8800GT 4Gb OCZ Platinum DDR2 
Hard DriveOSMonitorKeyboard
1x 80Gb Western Digital, 1x 250Gb Western Digital Windows 7 Professional x64 Sceptre X9 Gamer 19' LCD Razer Arctosa 
PowerCaseMouse
Cooler Master 700W Silent Pro Cooler Master HAF 932 Razer Diamondback 3G 
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post #2 of 5
Edit:
Blah, reading helps.

That sounds like quite the PITA.
Did you clear CMOS on both of the boards?
They should halt on boot if the configuration is different but I've seen stranger things happen..

Since he's provided all of the equipment, do you have any KNOWN WORKING compatible hardware of your own to test with?
Edited by beers - 2/5/11 at 5:46pm
Waiting on X399
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Waiting on X399
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AMD Phenom II B57 @ X4 3.9 Gigabyte 790FXTA-UD5 Sapphire Radeon 290 8 GB G.Skill 2133 
Hard DriveCoolingOSKeyboard
250 GB 840 EVO Noctua NH-D14 Windows 10 Logitech K350 
PowerCaseMouseMouse Pad
Seasonic x750 Corsair 600T Logitech G100s Razer Goliathus Speed 
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Plantronics Gamecom 788 
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post #3 of 5
I'd say motherboard myself. CPUs rarely fail, motherboards die a lot. If the mobo is dead, then look at the PSU, it may well be a hunk of junk that has just finished killing the mobo and is looking for desert in the form of a new one.
Ryzen 5 1600
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AMD Ryzen 5 1600 MSI B350 Gaming Plus Gigabyte GeForce GTX 1060 WINDFORCE2 OC 16GB (2x8GB) Corsair DDR4 Vengeance LED, PC4-24... 
Hard DriveHard DriveCoolingOS
256GB Samsung PM961 Polaris M.2 NVMe  1TB Toshiba DT01ACA100 3.5" HDD, SATA III  Cooler Master Hyper 212 Evo Windows 10 64 
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Ryzen 5 1600
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AMD Ryzen 5 1600 MSI B350 Gaming Plus Gigabyte GeForce GTX 1060 WINDFORCE2 OC 16GB (2x8GB) Corsair DDR4 Vengeance LED, PC4-24... 
Hard DriveHard DriveCoolingOS
256GB Samsung PM961 Polaris M.2 NVMe  1TB Toshiba DT01ACA100 3.5" HDD, SATA III  Cooler Master Hyper 212 Evo Windows 10 64 
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post #4 of 5
Thread Starter 
Quote:
Originally Posted by beers View Post
Since he's provided all of the equipment, do you have any KNOWN WORKING compatible hardware of your own to test with?
The eVGA 8800 GT, the various DDR memory sticks, and the 680W PSU all belong to us and everything is 'supposed' to work. That's why it's so puzzling.

We haven't tried resetting the CMOS, honestly never even thought of it, but I'll give it a try and update the thread if it does anything differently.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 @ 2.4Ghz eVGA 680i SE eVGA 8800GT 4Gb OCZ Platinum DDR2 
Hard DriveOSMonitorKeyboard
1x 80Gb Western Digital, 1x 250Gb Western Digital Windows 7 Professional x64 Sceptre X9 Gamer 19' LCD Razer Arctosa 
PowerCaseMouse
Cooler Master 700W Silent Pro Cooler Master HAF 932 Razer Diamondback 3G 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 @ 2.4Ghz eVGA 680i SE eVGA 8800GT 4Gb OCZ Platinum DDR2 
Hard DriveOSMonitorKeyboard
1x 80Gb Western Digital, 1x 250Gb Western Digital Windows 7 Professional x64 Sceptre X9 Gamer 19' LCD Razer Arctosa 
PowerCaseMouse
Cooler Master 700W Silent Pro Cooler Master HAF 932 Razer Diamondback 3G 
  hide details  
Reply
post #5 of 5
Thread Starter 
Alright, so after resetting the Asus board's CMOS we restarted it to get a 'NO CPU DETECTED' warning out of the connected speakers. I then proceeded to remove the heatsink and processor, cleaned them both off (paying careful attention to the CPU for any visible damage), reapplied some thermal paste and reinstalled them.

Now it seems to be working fine, albeit the BIOS sees the processor speed at ~5.2Ghz which is far from right. So I'll be running some stress tests, etc. to make sure everything is in optimal condition before returning the PC to its owner.

Thanks to those who posted their suggestions. Much appreciated. (+Rep to them)
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 @ 2.4Ghz eVGA 680i SE eVGA 8800GT 4Gb OCZ Platinum DDR2 
Hard DriveOSMonitorKeyboard
1x 80Gb Western Digital, 1x 250Gb Western Digital Windows 7 Professional x64 Sceptre X9 Gamer 19' LCD Razer Arctosa 
PowerCaseMouse
Cooler Master 700W Silent Pro Cooler Master HAF 932 Razer Diamondback 3G 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel Q6600 @ 2.4Ghz eVGA 680i SE eVGA 8800GT 4Gb OCZ Platinum DDR2 
Hard DriveOSMonitorKeyboard
1x 80Gb Western Digital, 1x 250Gb Western Digital Windows 7 Professional x64 Sceptre X9 Gamer 19' LCD Razer Arctosa 
PowerCaseMouse
Cooler Master 700W Silent Pro Cooler Master HAF 932 Razer Diamondback 3G 
  hide details  
Reply
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