My Dell Dimension 8400 appeared to be cycling on and off as if a power shortage had been occuring however, no other electrical appliances/lights in the house gave the same indication. I also have a surge protector installed on the computer. The computer was shut down and restarted. On startup, it is very slow. Takes 5 minutes or more for desktop to showup. After Desktop is up there is no internet connection (this computer is hardwired into the UVerse box). Other programs seem to run fairly normal. It will make copies, print and open applications without much trouble. I know the internet is alive as my other two computers in the house have wireless connections and work fine. I have run a virus scan, malware scan, defragged and used the Microsoft utility to check for file / hardrive damage. All was normal - no viruses or bad sectors on the drive. Where should I start to trouble shoot this problem? It seems like more than a network problem because of the very slow startup.