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but when i remove memory from mainboard i hear sound : 1x long sound and 2x short sound and no stop
Upon searching Google, I found your motherboard has AMI BIOS (correct me if I'm wrong), and that 1 long and 2 short beeps means video failure.
http://burks.brighton.ac.uk/burks/pcinfo/h...ost.htm#typicalNow, when did the computer stop working, and what did you do that you can remember before hand? How did you get it to boot its last time? If you can, try to get into BIOS and disable onboard video manually, if you haven't done so. Also, what type of interface are you using to connect your other video card in (AGP, PCI, PCI-Express)? If you're trying to use a PCI, I recommend you try to use an AGP instead, as for some unknown reason I kept getting a problem where a computer just wouldn't detect a PCI video card. Hope this helps, and tell us how things go.
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