I have an Studio XPS desktop that won't boot into Windows, startup repair doesn't work, System Restore fails. I have run Dell diagnostics on the system and it's really strange. When i do the Pre-boot System Assessment the Hard Drive DST says Warning - Hard Drive - No Hard Drive Detected.

Until recently, my PC Power Options worked just just the way I wanted--I had chosen the Dell plan, and set the monitor to go off after 10 minutes and the hard drive, never. Recently the monitor stopped going off. No idea why. I've tried the Dell plan, the other plan (Windows?

I currently have 2 GB RAM (1 GB X 2). I tried to install 4 GB more (2 GB X 2) and my computer would not initialize after power on. Is it even possible to upgrade this computer? Do the larger sticks have to be installed in the first to slots? I have never worked on a Dell and this has me stumped!