I have an HP Pivilion Slimline s7421c PC that was recently given to me. I had to replace the hard drive because it failed the SMART test. I have a brand new DVD. Both are SATA. When I attempt to install WinXP, after I hit a key to install from CD, my screen goes blank and it does not load from the DVD drive. I have tested the DVD drive, hard drive and WinXP boot installation on another system and all are fine. I've checked BIOS and believe I have all the proper selections. Everything is detected properly in BIOS (hard drive, DVD, Memeory). But for some reason it simply freezes when it should be loading WinXP, as if it can't locate it.