This is basically my first time ever posting in a forum so I apologize if I did anything wrong. My problem: The other day I came home and my computer was sitting at a black screen that said there was no boot media selected and that i needed to pick one. I went into the BIOS and it wasn't detecting any hard drives at all, I went through everything and nothing seems to be wrong in bios settings, the boot order is set to hard drive only. I tried unplugging it and switching SATA slots on my motherboard multiple times, as well as switching to a brand new SATA cable, I also switched the plug in coming from the power supply but it still doesnt work. Possible causes: 1. About 2 weeks ago i put in a new video card, xfx radeon hd 6850 and have been running a 27 and 20 inch monitor with it 2. a couple days after that i installed 64 bit windows 7. 3. Pretty dumb that i didnt notice sooner, but my main chassis fan is not working properly 4. pretty old hdd The computer ran fine for a week after putting the new windows in, my family says they never touched it so i assume their telling the truth. I have some ideas as to whats wrong, hoping someone could narrow it down for me. 1. new VidCard overheated motherboard somehow, seems unlikely tho cuz everything seems to be working fine except the sata hard drive. 2. hdd overheated?? 3. is it possible for the end of the cord that supplys power to the hard drive to come unplugged inside the power supply? 4. with new hardware, power supply was struggling and something failed in it. 5.hdd fried, its about 2 1/2-3yrs old so wouldnt be suprised. 6. delayed compatibility issue with windows 7 many of those are very unlikely, just looking for suggestions as to where the problem is,and what to do, Im using an asus p5q pro motherboard, 8gb corsair ddr2 ram, seagate barracuda 500gb hdd,intel duo 3ghz cpu, coolermaster case. not sure what voltage is on power supply. also 1 more question, if i buy a new hdd is my windows 7 code used up or will it work again with the new hdd? cause that would really suck if it didnt. Sorry I typed so much, trying to make it easy, thanks for any suggestions.