Acer travelmate 4150 laptop shutting down

I have an Acer Travelmate 4150. A couple of days ago i was working on it and it just powered off. No error messages or warning. It came back on no problem, and no events in the event log. It had been doing it all weekend.
Using the Acer Epower Management tool, i set the CPU speed to medium and it doesnt crash, but when its on maximum performance, it crashes around every half hour. Fan is sorking correctly and it doesnt seem to be overheating. It is out of warranty so cant return it to Acer!
Any help of comments would be appreciated.
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stephen98Asked:
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nobusConnect With a Mentor Commented:
check if the cpu gets hot (you may need to open it)
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AdamRobinsonCommented:
Heh.  Welcome to the world of Acer laptops.

Try the following:

Remove your battery (leave your power plugged in obviously).

Use it, and see if it crashes.

I've had two acer laptops (unfortunately), and both had the same symptoms you give, shortly before all kinds of things started to go wrong with them.  Removing the battery on both (not really a worry for me since the battery life on Acer's is atrocious) made all of the problems go away.

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nobusCommented:
>>  it doesnt seem to be overheating  <<  i suggest checking it in the bios, after some use.
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stephen98Author Commented:
Hi guys
thanks for the feedback. tried the removing the battery, doesnt make any difference, and i cannot get into the bios, i enter it for around ten seconds and it shuts down!
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AdamRobinsonCommented:
So you left the battery out?  Or removed it and put it back in?

It definitely sounds like an overheating problem if it's dying in bios.

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stephen98Author Commented:
i removed the battery and tried to use it without the battery in, still crashes though.
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rindiConnect With a Mentor Commented:
Use a can of compressed air and a vacuum cleaner and try to clean out the vents, or better, if you are OK with opening the laptop up, do that and clean it out. Acer laptops usually have a very close meshed heatsink which easily gets clogged by dust, so the fans might not be able to cool it properly anymore. If you open it up I'd also remove the heatsink, clean off all residue from the heatsink and the CPU, then apply a very thin amount of thermal transfer paste.
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stephen98Author Commented:
Cleaned out the fans, but doesnt make any difference, it still crashes after being on for a period of time.
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nobusCommented:
i would suggest some testing : ram and disk.
download the ultimate boot cd : http://ubcd.sourceforge.net/download.html    it contains a lot of tests
or try booting from a  knoppix cd; if it turns off, it is hardware problem
ftp://ftp.uni-kl.de/pub/linux/knoppix/KNOPPIX_V4.0.2CD-2005-09-23-EN.iso
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AdamRobinsonCommented:
I would split the points between yourself and Nobus, or delete the question entirely.  Both of your solutions may have worked, or he may have given up entirely.

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