I'm building my first rig and so far have been unable to get any kind of signal going to my monitor, everything is powered and I'm using Ubutu as my OS. The motherboard and gpu's will power up, however the gpu's stop spinning after about 30 seconds and my monitor simply says that there is no DVI-d input detected. I read on another post that when a PCI-e slot is detected the onboard connection is shut down so I now have my cable going directly to one of my cards, still no signal. Any help would be appreciated.
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If that doesn't work, unplug all cards and try with the cable going into the motherboard.
if it works with the cable into the motherboard, go into your bios settings and force the display to the motherboard. and then shut down hook up all your cards and boot back up plugged into the motherboard.
If you don't get picture from your motherboard output, with NO OTHER graphics cards connected, then your computer isn't turning on.
does tapping the power button make it turn off immediately? that's a good sign the computer never turned on.
you should be able to at least get picture and the bios splash page...
if you're not getting even that then your computer isn't turning on... stop thinking about OS if nothing else is happening.