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My laptop gets overheated and sounds very much. After some 3-4 hours its reboots itself,

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Ok,
Are you up for the challange?
Hopefully we can save your machine.
Turn over you notebook and remove all screws. As you are removing the screws put them inaway where you know wher that screw came from.Some of the screws will let you open some of the doors protecting Harddrive, memory, wireless etc.
One screw will help remove the CD
If you feel brave enough slighty remove bottom if possible... you'll fine a huge ball of dust and fluff which is why your system shuts down.
After removing fluff and dustball put machine together and start my machine.
Now if this is too much for you find a good computer Tech you TRUST. have him do the job, It will cost about 60-80 dollars

Posted on Jul 31, 2010

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Your fan may be broken or just clogged with dust and dirt.
Try an "AIR DUSTER" fo blow the muck away.
If you run it untill it reboots, you could be damaging many parts, CPU/GPU and other chips.
check youtube for tips on cleaning laptops

Posted on Jul 31, 2010

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“My Toshiba laptop suddenly shuts down by itself without any warning. Sometimes it works fine for hours, sometimes it shuts down in 10-15 minutes.” This complaint we hear from our customers over and over again. About 15-20% of all Toshiba laptops we get for repair, suffer from an overheating problem. Yep, OVERHEATING!
This is one of the most common problems with Toshiba laptops we deal with.
Indications of laptop overheating problem:
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  2. The CPU fans are working all the time at maximum rotation speed and operate much louder than before.
  3. The laptop suddenly shuts down by itself without warning. When it just started, the laptop was shutting down after 1-2 hours and how it shuts down after 5-10 minutes of operation.
  4. The laptop works fine when it runs idle, but shuts down as soon as you start using any memory demanding applications (DVD player, image editing software, video editing software, etc.).

Solution:
If the CPU heatsink is not clogged with dust and lint completely, you can use canned air and just blow it inside the laptop through the openings on the bottom and on the sides. It’s nice as a precaution measure, but it might not work if your laptop already has a problem and the heatsink is completely clogged.
  1. Open the laptop case, so you can access the CPU fan and the heatsink. In some cases you can access the heatsink through the latch on the bottom of the laptop. Sometimes you have to open the laptop case all the way down.
  2. Carefully disconnect the fan cables on the system board and remove the fan. If the fan makes unusual sound when it spins (grinding sound), I would recommend to replace the fan.
  3. Clean the fan and the heatsink with compressed air.
  4. I would also recommend removing old thermal grease from the CPU and applying new grease for better heat conductivity.

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http://www.howtoarchives.com/2009/12/fan-control-speed-for-laptop
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It sounds like an overheating problem. When it is booted, does it run ok other than just being slow? Check your cooling fan and make sure it is running and not stopped up. That is a number one symtom of overheating is freezing and rebooting by itself. There is a free program called "Motherboard Monitor 5" that will monitor the temp for you and set off an alarm when it is getting to hot. Check that problem first. Hopes this helps!

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