System wont post need help

culso

Honorable
Aug 13, 2012
26
0
10,530
Asrock z77 extreme 4
i5 2500k
hd7850

Swapped cases cause my old one didnt have cable routing and had been cut for my rad and now it wont boot. Is getting an A2 error on DrDebug screen but if I dont have a keyboard in it goes to a D7 which is no keyboard so if I plug it back in it hangs on a B4.
Any suggestions please help, need it back asap :)
 

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