Computer won't boot after BIOS update

[epilossi]

I have an ASUS P8P67 M-PRO motherboard, and after updating the BIOS to the latest version, the computer doesn't seem to boot - it sounds like it's powering on, the fans run, but the screen just stays black.

Here's how I got to this issue: I installed a new SSD (Kingston HyperX 120GB) today, and I had to get into the BIOS to change the boot order, but it turns out that I had forgotten the BIOS password. I cleared the CMOS RTC RAM to reset it.

Then later when I was installing Firefox, I got a BSOD that said "A clock interrupt was not received on a secondary processor within the allocated time interval." Rebooted and kind of ignored it and went about my business to see if it'd happen again, and it did a few hours later when I was playing a game, so I looked it up and found that it could either be due to an unstable CPU overclock (my CPU is not overclocked), or needing to update the BIOS. So I updated the BIOS, and now here I am. I've read some advice that said to clear the CMOS, but I've tried that like 5 times now and it didn't seem to affect anything.

I haven't had any issues at all with my computer since I built it a year and a half ago. I feel like there shouldn't be anything wrong with my motherboard because I've used it for that long without any issues, but I dunno. Any help would be greatly appreciated!

 

[bignastyid]

When you used the cmos jumper to clear the password did you move it back?

 

[Xttony]

Was The update process successfully completed?

1. Try starting with only one ram card one by one

2. Try removing the SSD.

3. Check power cables monitor, motherboard, dvi/hdmi cable

If these things don't work then your bios may be corrupt, go to an asus service centre to sort the problems out.

 

[hytecgowthaman]

Remove processor and fit correctly. check the cmos battery has power or try to change that.

 

[epilossi]

When you used the cmos jumper to clear the password did you move it back?

Yes, I did.

Was The update process successfully completed?

It said that it was successful and that it'd reboot, and that's when I started having the problem.

Thanks everyone for the suggestions, I'll try them.

 

[epilossi]

Turns out that it didn't like the fact that my HD 6950 was flashed to a 6970. I flipped the switch to make the graphics card use the backup, and now I can get it to try reading the files off of my USB drive (I have a different version of the BIOS on there that I'm trying to use) but it keeps saying "Reading failed". I tried reformatting the USB to FAT32 twice but it still gives me Reading Failed.

Oh, and I tried removing the USB drive and it's still "reading failed"ing at me.

Edit: Seems to be fixed now! I ignored the reading failed message as it only happened if I tried to use the mouse, so I just navigated the menu with the keyboard and reflashed the BIOS and everything seems to be okay.