This is unit #2
Dark Blue cover
This unit arrives with a request for DC Jack repair.
the jack repaired and unit plugged in to test and shuts off immediately. So I had to inspect inside.
Opening the unit to get to the GPU portion to begin diagnosis or repair. Because you have to remove the heatsink before the motherboard, and after removing it what I see is the 'Worst Case' scenario of how a GPU should look.
In an effort to get video working someone put balls of solder under the heatsink to apply pressure on the manufacturers solderballs under the GPU making contact with the motherboard. Along with way too much thermal compound. Though the idea was good in principle material used does more damage. The solder not only contacted/shorted resistors and jumpers on the top of the GPU but removed a number of them (probably inside a ball of solder). Those extra small resistors and jumper sets, clock speed and memory size information for nVidia.
But the unit was said to have worked!? Or so I thought.
The root cause of most XPS having no video and (using the nVidia chip) is contact oxidation. One or both, motherboard or GPU. Since the number of various manufacturers use this video chip, my guess would point to the GPU. Could it be the time it takes from nVidia to the computer factories allow for oxidation to develop on chips not shipped in Nitrogen sealed packages to save a few dollars?
I have seen the same issue with Gateway, Dell, HP and others.
Also appears to have a dead short between layers of the motherboard. Usually caused by forcing upside down harddrive into slot or screw or another part inside laptop.
DIAGNOSIS: Not Repairable