Macbook restarts radmomly, now will not not get past boot.

My friend's macbook which is one of the older style white ones with ddr2 ram would restart randomly at times. I replaced old Fijitsu the hd last May when it died with a 320GB WD Caviar blue series. It would boot up fine but if you tried to access the internet or something it would come up and say that the computer had to restart.
I ran the Apple hardware test from the first macbook install disk and it came up with a 4mem error code after 11 seconds. I figured it was the ram so I took out the 2x1gb of G.Skill ram that was in there and replaced it with 2x512 ram that was in there stock. Now when you turn it on it sits with the Apple logo loading and after about 5 minutes it shuts down again. After that I reset the pram and still the same thing.
I inserted the 10.5 install disk and it won't let me install the OS, it says that 10.4 or higher was not detected when there is 10.5 on it already. I went to the disk utility in the installer and ran the disk check and it came up with a bunch of errors. I erased it and repartitioned it and then went back to the installer and it still won't let me install, at the main installer page the continue button is grayed out. I also tried loading one of the time machine backups which it sees when the time machine hd is hooked up and asks to select a restore point but after it selects that it calculates the space needed and eventually goes back to the blank screen where it asks you to search for a time machine device.
thanks, if you need to know more info let me know.

I am certain that I have the right ram installed. The original Samsung ram was DDR2 512MB PC2 5300, and the stuff I replaced it with originally was G.Skill DDR2 PC2-5300 CL4D 4-4-4-12. The Samsung does not have the timeings listed on it. I originally bought 4 sets of these from Newegg and installed 3 of them in computers at work and then the one in my friend. All the others are working flawlessly so IDK why this would be different.
But the same issues are there with the original Samsung ram in it.

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