Ok, I installed a new (used in great and working condition) graphics card. I ten on my power supply, nothing yet, but as soon as I hit the power button, the entire computer lets out a loud whine/squeal. It may be the fan, but i want to rule out some other things first. I had to unplug a cable connecting the hard drive to the motherboard and I did plug it back on. The only problem is tere is 6 plugs for this cable, so I'm wondering if I plugged it in wrong. Also I'm wondering if it could be the power supply. If anyone can help, please do so.
I can not currently get the computer specs until later today. I am yet to install drivers for new graphics card. I am running windows XP.