Recently built a PC for a friend and everything was working fine. Took a break and later came back to finish installing various apps when I noticed on the bootup that I no longer recieved video to the monitor until the PC was at the desktop of Windows 7. The LCD displayed the message "NO Signal" until the GUI. Checked the connections and tried the secondary video port. I then tried 2 other CRT's with each giving similiar results. I cold booted and warm booted with the same result. Problem is I can no longer get into the BIOS screen. I cleared the CMOS but am still experiencing the problem. The weird thing is I was able on get into the BIOS initially without issue. It just started doing this out of the blue. But the video card and the system runs like a champ once inside Windows 7. Also of all the parts in the build the video was re-used from another PC that I upgraded. The video cards in question are GTX280's running in SLI. I also pulled out the other card and then swapped them testing the system with 1 card. Before I take and swap out a video card from another PC I was wondering if anyone has any other suggestions. 
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