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Computer will not boot - no signal getting to monitor

I have been given a computer for my grandaughter. When irt arrived there was no Hard Drive and the memory card was "loose.
I have fitted the memory card and added a Seagate 40gig hard drive.
When connecting the computer to the monitor, Key board, mouse, switch it on and the monitor just remains black - nothing appears. The motherboard shows AS Rock, and ATA 133. I know that the battery has been taken out and then put back in again. I think that the computer was originally "built" at a computer show.
Originally when starting I had the 3 long beeps, I have taken the memory card out and put it back in and now there is no beep at all.
I have tried another card (from another computer), and it gives me 3 long beeps, but I know this card is OK (working in other computer).

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Have you check the video card, is it loose, not sitting right, beeps are either memory, video or a bad mobo. here's a list of beep codes; the numbers represent the amount of beeps
1   The memory refresh circuitry has failed 2   Parity errors have been detected in the first 64 KB of memory 3   A failure has occurred within the first 64 KB or memory 4   System Timer failure: Timer 1 on the mainboard does not work properly 5   The CPU has generated an undetectable error 6 8042 Gate-A20 failure: BIOS cannot switch the CPU into protected mode 7   The CPU has generated an exception error 8   The video adapter is missing, or the memory on the adapter has generated a failure 9   The ROM checksum value does not match the value in BIOS 10     The shutdown register for CMOS interrupt channel 2 has failed POST; the system board cannot retrieve CMOS contents during POST 11 Level-2 cache memory has failed the tests, and has been disabled 2 short POST has failed, caused by a failure of one of the hardware tests 1 long, 2 short Failure in video system: a checksum error was encountered in video BIOS ROM, or a horizontal retrace failure has been encountered 1 long, 3 short Failure in video system: the video DAC, the monitor detection procedure or the video RAM has failed 1 long POST procedures have passed

Posted on Feb 21, 2009

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