Macbook Pro 13" problems opening apps, installing updates and lag.

Question

Hey guys i got a Macook Pro 13" a few months ago and now I cant open itunes or limewire and a few other applications. They just bounce for 30 seconds and i get a message that it's unexpectedly quit and the options if i wana report it or not. I've done repair permissions made a new account and still no progress. I've inserted the cd it came with to do a hardware test and as its booting back up I hear a click sound and everything shuts off. Another thing to add is that there is alot of lag takes awhile for it to open up the finder files.
Is this a RAM problem? I went to about this computer and it says the status is ok and iv taken out 1 of 2 of my rams twice too see if the problem still continued and it did. Or am I going to need a new hard drive?
Iv also tried to do a software update but as im installing it i get the unexpected quit error again.
please help

Answer 1

The 1600MHz RAM "should" work on a system that has a 1333MHz bus, since it is only going to down-clock the RAM; however, the system was not tested with this configuration and there may be unexpected behaviors from it.
If it's not specifically a compatibility issue with the speed ratings, it may be an issue with bad sectors in the RAM itself. To test this, load the Apple Hardware Test suite by booting your system with the "D" key held down (or Option-D to load the tools from the Internet). When the tools load, check the box for the extended memory test and run it. This will take several hours to complete, but will report any bad memory addresses it finds.
If you find any bad addresses, then you should be able to return the RAM for a replacement since most manufacturers supply lifetime warranties for RAM modules.