Excel error : “Not enough memory”

If it's Safari 5.1 you're in the same boat as a lot of people. The recommended suggestion is bail out and go to Chrome, but I like Safari so I've stuck with it. I've completely removed Flash from my system (I sandbox it in Chrome), I trash Safari's cache once a week, I completely shut Safari once every 4 hours, and I never have more than 10 tabs open at once. That keeps it relatively stable, but I'm probably going to move to Chrome as it's a bit much for one app.

The best thing with troubleshooting is to isolate the issue and keep good notes when the issue comes and when it goes.

Once you also have an understanding how to make the issue ( in your case, is that glitch constant or does it come and go ) it is then very easy to systematically isolate things.

In your case, switch the ram to the opposite slots, run with only one stick, then the others. Try to find out if it's the ram slot or the motherboard or the ram itself. Then you can isolate the sad by running a while on an external drive.

Repair technicians are very familiar with this process, and due to the volume of work they do, have better feel for what fails more often, have the tools to test booting your Mac from a clean OS externally, etc.

So even though you may not be as fast, skilled or familiar with troubleshooting by isolation, you can still use the same methodology to isolate this failure on your Mac.