Everything was going smoothly until I tried to add fourth hard drive to the system's fourth bay. I tried to turn on the computer again - white power light came on but it didn't boot from the drive. I took out the 4th drive bay and tried again but it will still not boot. This was possibly the first restart in a while so it could also be an update from a piece of software also. It does not appear to be accessing the hard drives at all. I have removed all external USB sources and I still get nothing. i have tried removing all but the first(system) bay and it stll won't boot. No chime, no screen, no dark grey screen. I hear what sounds/feels like the two fans going full power but nothing that sounds like HDD access. I don't know what the normal amount of time would be but it goes for a while - i haven't timed it, I interrupt it because i'm afraid it's damaging my computer further. I removed the graphics card - all the drives and but one set of DIMM's with no difference. Fans still stay on full power until I cut power. It does show the white power light on the front though. I have reseated all the memory as well - cleaning off as much as I could witha 12oz can of compressed air. Still no difference Any help troubleshooting would be much appreciated Thanks!