Memory doesn't work

A couple days ago I received a gig of RAM for my Powerbook. Thing is, with or without the factory-installed RAM inside, my computer will freeze up about 5-10 minutes after being turned on. I'm thinking all it is is that I received a bad stick of RAM, but are there any other possibilities that would cause something like this to happen?

>>12
>>13
what the hell, that has been fixed for at least a year

what are you guys running? the unstable 1.5 branch? or the even more unstable 2.0 branch?  just install the latest stable 3.0 build and you'll see what firefox is like, they even fixed a bad memory leak a month or two ago