MacBook Freezing and restarts
First time posting here to bear with me if I make any mistakes. I'm used to opening up macbooks and working on them. I've owned three macbooks, an imac, and a mac mini over the past seven years so I'm not afraid to repair.
I recently bought a macbook, (not my first), for a steal. The seller told me that it restarted itself when opening certain applications such as final cut so I took the chance and bought it.
I've noticed that it does it when trying to watch a video on youtube, launching certain applications, and other things. It will be working, and then suddenly it completely freezes up, and then after a few seconds, restarts and comes up with the "your computer has restarted because of a problem" line. This would seem to imply a hardware issue or kernel panic.
As for diagnosing the problem, I went through a few options before posting on here. I booted up from a clean install on an external HD just to see if it was either the HD or perhaps the HD Sata cable. The problem still came up.
For some reason, there is only a 4GB stick of ram in one ram slot. That implies an upgrade/modification by someone as apple installs ram in symettry. When moving the ram to the other slot, I was met with three beeps so I think that slot is bad. I tried other Ram sticks in a series of combinations and i'm still left with only the option of one ram slot.
I've reset the PRAM and SMC just to check and they had no effect on the computer freezing.
I did do a AHT on the macbook and was given the error repot: 4SNS/1/0000008 TC0D--124.
I've also been given the crash report from restarting which I can post on here if anyone thinks its useful. Either way, I'd love some help trying to diagnose the problem at least, and then I can get to work on fixing it (the part that I'm good at!).