I am having the same prob. I am using a xps 200s (?). I installed a hard drive and a modem. I had assumed, probably incorrectly, it was the Hard Drive causing the prob. I spoke with Dell, they said everything from resetting the jumpers on the CMOS to flashing the BIOS. Could not flash b/c the program wouldn't work without the nvram. I am waiting on another response from them. My comp will boot properly once i press escape, but that gets annoying. Modem does have jumpers, but a little more specific instructions would be GREATLY appreciated.