Having problems with your Dell Inspiron 6400 Notebook ?

My dell inspiron notebook 6400 shuts down and starts up automatically...what is going on...I don't use a battery so its not that...just use the ac

Answers :

By your description it sounds like your laptop is overheating. Many a laptop faces this issues because the Air Intake Duct is dirty, and the internal hardware.

When a processor in a computer becomes too hot, it shuts off. (More specifically BIOS turns it off) NO processor running, NO computer.

Since the opening for the Air Intake Duct, (Left front side), is on the side close to the bottom, it makes an excellent(?) location to 'inhale' foreign debris. Dust/Dirt/Hair/Food Crumbs/Lint, you name it.
When this foreign debris goes inside the Air Intake Duct it clogs it up, dramatically reducing the cooling efficiency of the cooling system.

The Air Intake Duct is connected directly to the System Fan, and this fan blows air through the Cooling Tube for the processor, and graphics.
The Cooling Tubes, One for the Processor, One for the Graphics), is about the width, and height of your little finger!

Use a can of compressed air for computers, and blow out the Air Intake Duct. (AC adapter removed,{Charger}, and battery removed)
Do NOT blow out the Exhaust Duct!

Use Short Bursts of air, not Long bursts.
You will be blowing air directly on the System Fan. This fan is only designed to spin so fast. Spinning it faster than it was designed for, can lead to premature failure of the fan's bearings.

Take a look at this,
See Number 12? That is the Processor Thermal Cooling Assembly. The copper colored S-shaped piece is the Cooling Tube.
Number 14 is the System Fan.

This is the Service Manual main page,

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