Macbook Pro freezes randomly, but can trigger it also

I have a Macbook Pro that I use for work. Randomly it will freeze on me and will be unresponsive. Any device, like external disks or my iPhone will disconnect immediately when this happens. I have run the Apple Hardware Test dvd that came with it. It does have RAM installed by my IT but the full hardware test did not show any issues.
Although it is typically random. It appears to happen more frequently while I am on battery.
I can trigger it almost immediately if I am on battery power, I launch iTunes and I play any movie. It will freeze within minutes. Playing the movie, minimized, full screen, etc always results in the Mac freezing.
Very infrequently along with the freezing the Mac will emit from it's speakers a harsh noise. It is coming from the audio system, as it will play through my headphones when I have them plugged in. This probably the most jarring, as when I am commuting on the train and it does this, it frightens the other passengers.
Every time it crashes I have to hold the power down to shut the computer off.
Again, this is my work computer and I need it to do my job. There are no replacements at my work.
What options are available to me? Ideally I would like to get Apple to replace it. But it is defiantly past the 30 day return policy.
Thank you for your help!
Hardware Overview:
Model Name: MacBook Pro
Model Identifier: MacBookPro5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 3 MB
Memory: 4 GB
Bus Speed: 1.07 GHz
Boot ROM Version: MBP51.0074.B01
SMC Version: 1.33f8
Sudden Motion Sensor:
State: Enabled

Your MBP should never freeze. Freezing can have several causes, and it's possible to do some troubleshooting here, but it may be best to just take it in to Apple or call. You ran the AHT, but there are other things to try.
Try the original Apple RAM. The AHT does not always find RAM issues. If no freezing with the original RAM, there may be a problem with the new RAM. (If you go to the Apple Store, put back the original RAM. If you don't they may blame everything on the new RAM and not look further.) Also check in the System Profiler to be sure all of your RAM is recognized.
Reset the SMC:
http://support.apple.com/kb/HT1411?viewlocale=en_US
Reset the PRAM:
http://support.apple.com/kb/HT1379?viewlocale=en_US
Try a Safe Boot:
http://support.apple.com/kb/HT1455?viewlocale=en_US
Back up all of your data, and reinstall the OS, preferably using an Archive and Install:
http://support.apple.com/kb/HT1545?viewlocale=en_US
These are things they would likely have you try anyway, so you may as well go ahead and try them to see if anything helps. Very likely they won't seriously look for hardware issues until you have eliminated software issues.
You are still under warranty, so they will fix whatever is wrong.
Good luck!

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