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[LGA775] ASUS P5Q + Core 2 Quad = no POST beeps, no display

post #1 of 6
Thread Starter 
Picked up a free PC today from a friend. It won't turn on.

I've been tinkering with it for a couple hours now and here's where I'm at:


I have the motherboard removed from the case, I have reseated the CPU and heatsink, hooked up a known working PSU. With no RAM installed and no video card (this motherboard has no onboard graphics), I was expecting some sort of beep codes. I get nothing. The system powers up in silence, fans turning but no beep codes and no display.

This is the same result I had when the system was completely assembled earlier. Fans on, no beeps, no display.


Am I looking at a dead CPU? That'd be a shame, seems the Core 2 Quads are not cheap even now and they look about the best CPU you could stick in an LGA775 unless I'm mistaken. frown.gif


Any way I can test this further without ripping the CPU out of my other LGA775 system to try that one?


It's worth mentioning I've tried two PSUs, two graphics cards and one random other DDR2 stick I had laying around, all the same result. Aaaand because everyone loves pictures (even crappy ones!):




Thanks,
Sam
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post #2 of 6
Probably you have a dead motherboard there, CPUs aren't known for dying.

You have also tried it with another PSU, RAM and graphics card and still no go.

I'd put my finger on a motherboard failure.

Also I would try a older CPU, for example a Pentium or an early C2D, maybe you just need a BIOS update to run a C2Q.

What's your CPU? Maybe it's a Q9450 or Q9550 E0 stepping which requires a BIOS update to run on that motherboard compared to a earlier produced C2Q processors.


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post #3 of 6
Double post.
Edited by KingT - 4/5/13 at 12:19am
     
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E6750 G0 @ 3.3GHz (1.25V LOAD) Asus P5KPL-VM G31 GeForce 8500GT @ 700/1600/445 Apacer 2x1GB 800MHz 
Hard DriveOptical DriveOSMonitor
Hitachi Deskstar 160GB (7200,8MB) LG DVD Win 7 Ultimate 64bit build 7601 LG 19" 
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5$ keyboard Cheap stuff Linkworld crappy/modded SmartBox cheap 
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Hard DriveOptical DriveOSMonitor
Hitachi Deskstar 160GB (7200,8MB) LG DVD Win 7 Ultimate 64bit build 7601 LG 19" 
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post #4 of 6
Do i see some charring around the northbridge or am i wrong?
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Ayase Eli
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Zotac SSD Premium 480GB OCZ Vector 180 480GB Hitachi 7K3000 3TB 7200rpm ID Cooling Frostflow 240L 
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post #5 of 6
Thread Starter 
I think it was a Q94xx (9400?) but it's under the heatsink now tongue.gif so I'll confirm that later on.

I'll pull the CPU from the other tower tonight and see what happens.


My impression when I picked this up is that it used to work. I actually thought I was picking up a running tower, but that's OK - it was free!

I'll try another CPU and see if I need to find myself a new (ebay 2ndhand) board!

Quote:
Originally Posted by DaveLT View Post

Do i see some charring around the northbridge or am i wrong?
Nope, I think what you're looking at is the reflection of the heatsink smile.gif
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post #6 of 6
Thread Starter 
OK I have tried a known working CPU in this PC and there is no change.

This makes me think the motherboard is shot. Just to make sure it's the board and the CPU is good I tried the CPU in my running LGA775 system. Now that won't boot either. No POST, no display.




Interesting smile.gif



Oh and the CPU is a Q9400 btw. Here's exactly what's written on it:
INTEL '06 Q9400
INTEL CORE 2 QUAD
SLB6B MALAY
2.66GHZ/6M/1333/05A
L911B298


Perhaps my P9657AA-8KS2H needs a BIOS update to run it.... google tells me nothing about that, still it can't hurt to try!


Edit: Or I could just be an idiot tongue.gifthe Q9400 is not supported on the 8KS2H board.
Edited by savage1987 - 4/5/13 at 3:29am
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240GB SanDisk Extreme SSD 1TB WD Caviar Black 2TB WD Green ASUS 24x DVDRW 
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Noctua NH-D14 Windows 7 Home Premium 64bit 27" ASUS VE278H Saitek Eclipse II 
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