I just installed a 9800GT but when I powered up the monitor was not receiving a signal. I took out the 9800GT and put my old 7950GT back in. Same thing. I can hear the HDs power up and everything else powers on, including either video card but the monitor still receives no signal. I plugged the monitor into my laptop and the monitor worked just fine. I'm flummoxed. I believe the computer is not posting but I can't remember if it ever made a beep to let me know that it had. I'm guessing it isn't posting but no 100% sure. Anyone have any idea what could be wrong? Here are a few things I already tried.
I checked all the power connectors to make sure they were all tightly plugged in. I removed the Cmos battery for a few minutes. I removed the video card and tried booting but still no beep (not sure it had one to begin with).
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Make sure you plugged in the 4/8 pin CPU power.
Well I am stupid and didn't have the 4 pin plugged in. I did that now, however this didn't fix the problem. I did notice my "Dbracket" (4 LED lights that let me know potential problems with booting) had the two bottom LEDs red. According to the user manual it means: "Decompressing BIOS image to RAM for fast booting "
However it just sits there and never goes any further. It should eventually turn all green.
Use the delete key to get into the BIOS. Make sure your type of keyboard is enabled (usb or PS2).
Never mind. I have diagnosed the problem. The problem is I am an idiot. After plugging the 4 pin power back in I removed the CMOS battery for 5 minutes and now both video cards work fine and the computer boots fine.
Thanks for your help though with reminding me to plug the CPU power in.