Question about having a Blue Screen of Death!

Ok my friend is having a problem with his Dell, and that problem is that he has been having a blue screen saying some kind of error occured on the computer while working on it, know my concern it might be the RAM or it might be something else such as the CPU or maybe something else. Anyone out there who thinks they can help me, please let me know, thanks.

Best way to check the RAM is to try one stick at a time.

I would also suggest you mention here any STOP codes that generally appear on BSOD as those are sometimes very informative to look up what the cause can be, or within the least isloate the problem to 2 or 3 possible reasons why.