Hello there, I'm helping my friend put together a new computer and we're having a bit of an issue. Originally, we were using a GTX 460 for the video card, but unfortunately, the power supply did not have enough PCIe connectors to power the card. Before we figured this out, we booted the machine and installed Windows, and the computer worked fine on the motherboard's onboard graphics.
So after figuring out that the GTX wouldn't work with this power supply, we decided to use a Radeon HD 5770 instead. Now, the computer will still start up and everything, we just can't get anything to show up on the monitor. We have no idea why and are out of ideas.
I'm not sure what other kinds of information you'll need, but if anything else is necessary, I'll do my best to give it to you guys. This is my first post here and I would really appreciate any kind of help you guys can give.
What make/model of power supply are you using? Did you connect the external power connector to the HD5770? Also, are both the 24-pin and 4 (or 8)-pin power connectors firmly connected to the motherboard?
Even a defective card may send the necessary signals to the motherboard (that a video card is present) so that it will boot. I assume you can access the system remotely to verify that it actually boots successfully. Is that correct?