I bought a PSP today, and along with with it I got two used games. After getting through setup without any problems, I tried out the games. The first one ran without any problems, but the second one made a grinding sound every time it loaded.

I tried taking it out and putting it back in, but it still grinds, and the other game now grinds occasionally, but only for a second at a time, which hasn't been too often.

The PSP is new, so I'm pretty sure it isn't the problem, but it does tell me that the firmware needs updating. Anyone think I should take one or both of the games back tomorrow? or am I just being paranoid?