Quick Help! OC failure :-/

[karlChev]

Was running my Ivy i7 3770k at 4.40ghz for some time now, decided to have a play around this morning as i woke up strangely early. OC'ed to 4.60ghz and was idling at 40c with my h100, so i decided to push it to 4.80 to see what i could get from it. I saved and rebooted, now i get a black screen and in the top left corner a _ sign, and botton right it says A2 in white :-/ Wtf? Ive had it at 4.8 before and it ran fine. I also tested my SSD boot drive in another pc and it booted fine, so thats all good.

Im running a

i7 3770k on a
Z77 MSI GD43 Mobo (Clocked at 4.80GHz, but like i said...wont boot, properly)
H100
AMD 7970 @ 1Ghz
8g corsair vengence
750PSU
chronos 120G SSD
1TB Caviar Black

Help

[marsey99]

unplug, hit the power button a couple of times to remove any power and hit the clear cmos button the back, then start again

[karlChev]

And where is the magic clear CMOS button? Thanks btw !

[marsey99]

ah, gd43, no button, you need to jump the 2 pins next to the bat on the board.

[karlChev]

Took the battery out in the end=p Thanks!