ok so about a month ago i installed 1gb memory on my mac and it seemed to be working fine. Then my brother installed a router as well and a few days later my computer was freezing up on pretty much any application and internet. Then it finally froze on startup and i could not get it started. i performed a hardware test and i did get an error but since my warranty ran out they could not help me and i don't know how much it will cost me for the repair.So now basically tried to reinstall the installation discs and it worked except not on all programs (safari,firefox,itunes etc) i got into aol which is how i am writing about this problem. What could be the problem is it worth taking for repairs? please help