MacBook Pro Crashes (shuts off completely) w/ no warning & no error message

I have a MacBook Pro that I have been having issues and I am asking for some help. I had been having a problem where the computer has been crashing unexpectedly. Seems to revolve around anything where a lot of memory usage was occuring and/or when I was watching any videos on line. I thought it might have to do with how hot the computer was getting so I put it up, seemed to help a little bit. However on a whim I brought it to best buy (closest Mac Store 2 hrs away), they said it was snow leopard, so they did a uninstall/reinstall, didn't work...then they said it was the hard drive...so I got a new 250 GB hard-drive installed...still having the issue. Infact now seems to be worse, seems to be hotter now than it was) Uninstalled/reinstalled flash...same issue...ran first aid...same problem. It was occuring both before and after the snow leopard install.
Any help???

To answer the questions, it was happening when it was plugged in, didn't seem to have the same problem when i was on battery, or it just wasn't as quick.
Anyways, I brought it to the Mac Store last night to have a genius look at it. He did everything that you all mention including running iStat. At first he couldn't replicate the problem and therefore couldn't figure it out. But just for discussion sake and since I was looking at iStat app, we starting looking at YouTube while it was plugged in, which is the quickest way for it to crash when I'm at home. As soon as I started doing that, Safari starting using 89%-90% of the available memory and the temp jumped from 150-160 degrees to a whopping 211 degrees. We checked the fans and the fans were working "fine."
After seeing that, the technician tried to install some software updates and it immediatley crashed. After pulling up some scripts he told me that the logic-board is defective. He initially thought what was shutting it down was the thermal protection, however it wasn't being shown in the scripts. However since it shut down so quickly (think of flipping a light switch quick)he thought maybe it wouldn't be shown.
Anyways, I'm having it sent off to get a new logic-board installed. I'm going to keep this open till I get it back and know that was the issue.
Thanks to both of you all for the help.

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