Home built PC which has worked for years will not boot past post. Scrolls through post than screen goes dark and hard drive does not run. I have gone to bios and saved safe settings,no change. The monitor is getting signal (power light stays green). Hard drive does show a little activity when power/post is going but stops when it's time to bring up Win XP screen splash. Ideas? Suggestions? I've checked SATA and power cables. Don't see anything obvious. I'm thinking it's time for a new build.