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Motherboard beeping 1 short 1 long

Last response: in Motherboards
July 12, 2012 7:38:36 PM

Ok guys basically I have a Compaq presario SG3 120UK 2 days ago I bought a RAM without looking at the comp ability so I realised that the ram wasn't because it was a ddr3 slot. I took out the old one just to check the size and put it back in, then once I started my computer is started beeping 1 short 1 long. I can't access my BIOS because I have a black screen, also the graphics card is ATI radeon 3000 and it is integrated. Can somebody help me I would appreciate it. :) 
a b V Motherboard
July 12, 2012 7:56:25 PM

try with single stick ram, also reset CMOS battery.
a b V Motherboard
July 12, 2012 8:25:52 PM

compact : one long one short is cmos checksum error, i dont see 1 short 1 long.