Dell Desktop won't boot up
I had a similar problem a few years ago. (Can't remember the model, but it was a Dell desktop.) It turned out to be a corrupt piece of RAM. Try removing one at a time and booting up. That may help.
edit: this post is showing up as #1 in the thread, with a time stamp 8 hrs before I actually posted. Not sure what is going on, but hope you see this and it helps.
PS: I can't predict the future, or else I would have giant winnings from the lottery by now!