Tonight I replaced it -- it didn't work at first then I waited 2 min per the troubleshooting and tried again -- computer booted up as normal and I hit F2 for system defaults when it detected the new hardware. Then I had the same graphics/bootup problems as before and had to reboot twice. Still worked. Then I turned computer off so I could screw the PSU in place for good and put case back on. Now the harddrive (I think) beeps on startup, the DVD and CD drives' lights go on for a second and then go out, and the monitor won't turn on at all. All the fans are working and comp is running though. I opened it up again and made sure all connections were secure -- still wouldn't work. I have a second computer in the home and I opened that one up to make sure I made the right connections -- yep, I did -- still won't work.
I have 2 major problems but I need to tackle this PSU problem first. Please advise, thanks.