I have no idea what the problem is. I have a dimension 4700 with intel pentium 4. I run Windows Professional SP2.
Every time I start up the computer, it shuts back down and restarts after the Windows screen is finished loading. It won't let me boot into safe mode and I have a windows recovery thing.
The computer can boot from a different OS though. I installed a bootable linux in my flash drive and it works fine.