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I have a laptop, Compaq presario CQ50, when using it after one hour it gets hot and goes off, please what is the problem

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There are cooling fans that need to turn on, and also it has heat syncs that need air flowing across them to remove the heat from your CPU. Check that there are no blockages in or around the fans or vents. If there are, you will need compressed air to blow it all out. Do not put air on fan blades unless something is keeping them from spinning up while you blow it out. Might need to take it in to get it cleaned. If that's all clear, and you see no fan running when it warms up, then you will need to replace the cooling fan.

Posted on Oct 04, 2010

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Two possibilities:
* the inside of the computer is covered with a layer of dust, which acts as insulation, preventing the computer's fans from cooling it.
When it gets "too hot", it shuts itself down.

* the fans inside the computer have failed (bearings seized?)
and no longer are pushing cool air through the laptop.

Turn the computer off.
Disconnect the AC power.
Remove the battery.
Purchase a can of compressed-air, and give your computer a "blow-job" through every vent and intake/exhaust areas, to try to remove the dust.

Posted on Oct 04, 2010

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