I noticed that the game that doesn't work has a warning on the cover about being protected by technical means, while the one that's working hasn't. I've never heard of DRM causing issues on consoles, but, judging from my experience with copy-protected audio CDs, maybe protected discs are harder to read for older (perhaps more imprecise) lasers? Or is it just the disc not working anymore due to old age? Does anyone have experience with something like this?
Unfortunately I bought the game in another city, so I can't just bring it back (yeah, 'smart' move on my part, but I'd assumed they'd test these things before selling the games and the thought that the discs might not work didn't even cross my mind). Is there anything I can try and do or do I just have to accept that I lost 15 bucks due to my naivity? :/
EDIT: I remembered that I had this issue with another of my old discs, but in that case the disc was working before and the next time I put it in the drive, it was not recognized anymore. All other discs still work perfectly.