Dell XPS M1530 not powering up, worked fine for 3 years

Hi,

I have a Dell XPS M1530 which has been working perfectly fine for the last three years. Recently, it's refusing to load up. Initially, when I pressed the power button, it was showing the num lock sign and not powering up. After running the diagnostics test with the fn+power keys, the diagnostics were fine but now it just isn't powering up at all. When I press the fn+power button again, the num lock icon is blinking, and the other two lights are staying static. Please help. I need this resolved asap.

Calling tech support isn't an option, since my warranty has conveniently expired. I recently had my hard drive, cd drive and keyboard replaced but this is entirely unrelated. It's not a hard drive issue. I've done a ton of reading on this and it seems like it's either a nVIDIA gpu issue, or it's some other issue. The system was bought while I was in the US and I've been in the UK for the last year, where I was covered under international warranty. Now that it's run out, my XPS has decided to start giving me issues, and apparently I'm not the only one.

If there is some way that this issue can be resolved, I need it. PLEASE HELP ME!!

ETA: Initially, it was a power issue. I changed my AC adapter, the battery was charging and it was working yesterday. When I shut it down last night and tried turning it on again this morning, that's when the issue restarted.