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Ghost in machine? PC suddenly cannot post!

S

stubblepoo

Junior Member
So my lovely Rig of 3-4 years has all of a sudden decided to start playing up...

Initially the wifi card stopped working - in device manager the card was there but with the little yellow exclamation mark and said there was no driver, however I decided to leave that to another day as i didn't really need internet on that PC at the time.

New problem happened today. Was gaming in the morning all fine, shut everything down for lunch/ a break but when I started up the PC again the screen said no input. Checked the cables and the screen with a PS3 - all fine. Opened up the case and saw the mobo was stuck on code 78.

The Mobo is an asrock P55 extreme so managed to track this down- http://www.evga.com/...spx?faqid=58950- which suggested it was a USB problem.

I have unplugged everything except power and HDMI from a 970 and left it for a good 20 mins to clear CMOS etc. but this has changed nothing

then i tried removing the usb header, managed to get to code 2A which here suggests is due to a faulty raid card (http://www.tomshardw...ost-code-solved) removed that and now i am back at 78!

at my wits end!
 
When things fail like that, the most likely possibilities IMHO are the PSU and mobo.

Are there any swollen or discolored caps on your board?

How old is your board and PSU?
 
The manual for your board says that error code 78 is:
Initializes IPL devices controlled by BIOS and option ROMs.
Click to expand...
which indicates a problem with storage devices and/or their respective controllers. Now that could be the Intel P55 chipset, or possibly something connected to it.

You first might want to try resetting the BIOS. If that doesn't help, disconnect everything save the CPU, RAM, and video output, and see if it will post. In other words, disconnect all drives, external devices and cables, wifi card, etc, and see if that makes any difference.

Edit: I see fralexandr beat me to the code, nice!
 
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