Hi, Dell support has came to my house more than 5 times, replace memory, motherboard, graphic card and the most recently, remove raid 1 configuration. All does not work. I had read a similar post in this forum "http://social.technet.microsoft.com/Forums/en-US/w7itprogeneral/thread/3eb6fc98-bbc6-49f4-bc47-f36cf4201902#3eb6fc98-bbc6-49f4-bc47-f36cf4201902". How/where can I get here to resolve this this? I am quite tired of trying to replace this and that and all does not work. Thanks a million. Cheers.