Bad Inverter? (600m)

Hi, Thank you for reading my question.

Problem:   My laptop (Dell 600m) screen went black suddenly. When I would restart or hibernate then turn it back on, the screen would stay lit for about ten seconds before going black again. I read a bunch of advice online that led me to believe my inverter was bad. I bought a new one and installed it carefully. My screen then worked for almost a day, then went black again, and now it goes black after about ten seconds upon restarting, etc.

A few more facts:   When the screen did work with the new inverter, it flickered continually (not too bad) and the bottom right corner of the screen (near the Windows clock) spread blackness very slowly until it covered the clock and a tiny bit more, but did not spread farther than that. When the screen saver came on for a while, and then I returned to the computer to use it, the black spot was gone and started over again from the corner. Also, that corner of the screen was very hot to the touch, but no other part of the screen was. I need new hinges; the right one has been broken for a while, so I have had to keep the screen close to upright (and the right one broke while I was fixing--oops!). I just ordered a new pair.

I don't have replacement parts, but when I go back home to visit, I know two people with a 600m in case I really had to test the parts, etc.

Question:   I can exchange the replacement inverter for a new one, but based on the facts, does anyone have advice on what it might be? Did I get a bad replacement inverter? Is there something else wrong that will keep ruining any new inverters I install?

Matt