I have an xps 210 that quit working. When I press the power button I get get an amber flashing light on the button. I get no diagnostic lights. I replaced the CPU cooling fan with no change. I replaced the mother board with no change. I unplugged each component, hard drive, DVD, USB port, one at a time with no change. The lack of diagnostic lights points to a pre bios problem. When it first tries to power up the hard drive cooling fan and the power supply fan both start to move and then quit. I jumpered the proper pins on the power supply to make it start and got the correct voltages on the ATA cable. I suspect the power supply, but not sure. I will end up buying a complete new unit one part at a time at the rate I am going. Any ideas?