Computer turns on, but the monitor remains blank!

Detrimentum

Detrimentum

Detrimentum

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8 Jun 2009
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On Friday I ordered a new CPU (Intel Q9400) because my E4600 was getting boggy and was struggling with more recent games. I did about 5 hours of research on the web to make sure that the CPU was compatible with my Motherboard (ASUS P5N-D 750i). It arrived Tuesday, and I proceeded to install it into my computer at about 3PM, After I "successfully" installed it, I applied thermal compound and placed the waterblock back onto my CPU, I then followed to plug everything back in and power up my PC.

Now this is where it gets interesting. Everything turns on and powers up (All the fans spin up, power LED and HDD activity LED all blink (Power stays lit)) Yet I get aboslutely nothing appear on the screen, also the case speaker does not beep like it did previously. Previously it would beep once and proceed to the flash screen and OS. Now it makes absolutely 0 beeps.

From what I understand from googling the problem, the way to troubleshoot the issue is to remove everything except the core components (CPU, RAM, Motherboard, GPU) and try and POST again. If this fails then what I believe I should try next is to take out all the RAM and hope that the speaker beeps, to prove that my Motherboard is OK. If this works then I shall swap out the new Q9400 for my old E4600 in an attempt to check that it still works, if it does then I shall attempt to RMA the new Q9400. I cannot do this at the moment for I am currently at College using the library computers. :rolleyes:

Any further suggestions would be appreciated, thanks for being bothered to read my poorly written desperate plee. :D
 
Sounds like you've got a good strategy there, you've presumably checked the power connectors to your MB and they're ok. I had this symptom before and I'd forgotten to plug in the smaller power connector. I've also had this issue and it turned out to be a borked PSU.

Anyway, hope you get it sorted.
 
Try reseating the CPU. I've had PCs not boot until I reseated the CPU then it booted. Worth a shot. As sk3plh said, reconnect all connectors incase something got knocked loose.
 
Well your motherboard seems to support it, have you tried resetting the CMOS? Also try booting with just one RAM stick particularly if you currently running dual channel.
 
First thing is to reset the CMOS and check everything is plugged in securely. If you don't have any luck with that, check the motherboard manufacturer's site for a BIOS update.

If you still have no luck, go back to the E4600 and test with that. You might have been unlucky and bent a pin changing the CPU or something. :(
 
UPDATE: I updated the BIOS to 0801 which according to ASUS's website is the supprted version, still had no success. I reseated, still nothing. So I swapped back to my E4600 and it booted perfectly like it used too. Now I'm unsure whether to try again with the Q9400 or RMA it for a replacement.

Thanks for all the suggestions guys.
 
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