My customer has a Dell XPS 710. It is running Windows Vista. He was experiencing startup/power issues. He would have to try several times to power the unit up. If he let it sit for a while it would eventually power on. Now it gets an amber powerlight for 1 to 2 seconds, the power supply fan turns on and then off. I tried another power supply (a DR552 - 750W) and get the same issues. What else could it be? I assume it could be the motherboard but i don't understand how the motherboard would have the intermittant issues that the customer has originally been dealing with.