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P5KC won't POST after Q6600 lapping & overclock

post #1 of 2
Thread Starter 
Hi. Was hoping someone could give me some pointers to diagnose this issue.

My Q6600 has been running a stable 3.0GHz overclock for around a year now, but the ide/load temps were quite high (~45/65ºC), so I decided I would lap the CPU and heatsink. Lapping went fine and the computer booted into Windows 7 normally with amazing temps (~25/45ºC)(old thermal paste had dried in places)! So I decided to get a bit more aggressive with the overclock so I bumped up the FSB from 333 to 350, and still got great temps and was passing multiple iterations of prime95.

Now this is where my hubris may have killed my CPU or motherboard- I had seen threads where others had OC'ed their Q6600 to 3.6... so I was like hell, let's bump the FSB up to 400MHz and see what this baby can do (did NOT increase the voltage here). Computer shut down, rebooted and POST'ed showing CPU running at 3.6GHz. Was able to select Windows 7 from the bootloader and got past the Windows 7 splash screen before it hung on a black screen, so I was forced to hold down the power button.

Normally when overclocking this motherboard, if the OC (RAM, in the past) is too high the fans will spin up for about 1 second, turn off, and back on again as the motherboard resets and the POST will say "Overclock failed!" while running the CPU at stock speed. However, this time when I tried to restart the computer, the CPU fan turned about a quarter turn and immediately turned off.

Tried reseting the CMOS by pulling the battery and setting the CLRTC jumper (left the battery out overnight), putting the jumper back and then the battery, but no luck. Also, I can remove the CPU power cable and the fans will spin for about 1 second before turning off. Tried removing all SATA drives and all but one RAM stick, (CPU power plugged in) same result - quarter fan turn, then silent.

Can the CPU be killed by a simple FSB overclock?
Can the motherboard be blown from trying to OC too high?

I don't know if this is relevant, but my P5KC has been crossflashed with the P5KR for AHCI support- it shouldn't matter when I reset the CMOS, right?

If anyone could help me diagnose this, it would be greatly appreciated.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 P5KC 9800 GTX 8GB DDR2 
Hard DriveOS
80GB SSD, 2TB HDD Windows 7, Mac OS X 10.6.6 
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My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
Q6600 P5KC 9800 GTX 8GB DDR2 
Hard DriveOS
80GB SSD, 2TB HDD Windows 7, Mac OS X 10.6.6 
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post #2 of 2
the board may have died mate...if it was a CPU problem it should diagnose that and beep. if you can RMA it, do it
I need upgrades
(21 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X6 1090T Foxconn A79A-S PNY GTS450 XLR8 KVR800D2N6/2G 
Hard DriveHard DriveHard DriveHard Drive
WD2500AAKS WD3200AAKS WD10EARS WD3200JB 
Optical DriveOptical DriveCoolingOS
Asus DRW-1608P2 Asus DRW-1608P2 Corsair H70 Ubuntu Server 10.10 x64 
OSMonitorKeyboardPower
Windows 7 Professional x64 SP1 ASUS VW193S Logitech EX100 LC-Power 650W 
CaseMouseAudioAudio
Coolermaster Stacker 830 SE Logitech EX100 Creative Audigy 2 ZS Creative i-Trigue L3450 
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I need upgrades
(21 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X6 1090T Foxconn A79A-S PNY GTS450 XLR8 KVR800D2N6/2G 
Hard DriveHard DriveHard DriveHard Drive
WD2500AAKS WD3200AAKS WD10EARS WD3200JB 
Optical DriveOptical DriveCoolingOS
Asus DRW-1608P2 Asus DRW-1608P2 Corsair H70 Ubuntu Server 10.10 x64 
OSMonitorKeyboardPower
Windows 7 Professional x64 SP1 ASUS VW193S Logitech EX100 LC-Power 650W 
CaseMouseAudioAudio
Coolermaster Stacker 830 SE Logitech EX100 Creative Audigy 2 ZS Creative i-Trigue L3450 
  hide details  
Reply
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