Basically I have a MacBook here that's acting up. It'd occasionally refuse to wake up, or sometimes it'd wake up, but goes right into a rainbow wheel of death. It's clear that the MacBook croaks at those occasions when loading from the pagefile. It's a common cause of RAM failure, so I promptly tested the 4 GB of RAM in it with memtest. Unfortunately (because it makes things complicated), the RAM passed the tests with no problems. I let it run for three rounds, no problems. I checked the SMART status of the hard drive, and it's fine. I verified the disk with Disk Utility. All seems fine. Now, here's my problem: it's clear that the problem stems from the hard drive or the RAM. But I don't want to waste my money buying one part, only to find that it doesn't resolve the problem. Does anyone have any advice?