I recently acquired an N9 from ebay for $30, and spend another $30 on a replacement screen, the screws were stripped and had to be permanently removed with a flathead screwdriver.

The N9 does not boot, and the only two causes I can think of are:
1: The proximity sensor may not be in correctly (a bit loose).
2: I'm using a Nokia n900's USB cable to charge it, which makes a white LED pop up.
Any attempts in detecting the N9 for flashing have resulted in nothing, no other computers appear to be able to detect it, even with libUSB.

What can I do at this point to get the N9 into an operational state?
The internals appear perfectly fine, although I shudder to think what happened to damage the gorilla glass so heavily originally.