Having problems with your Dell Dimension 2400 PC Desktop ?

Switching on but only stays on for a couple of seconds before going blank. If switched off and on it will come on but only stay on for 2/3 second,


Answers :

Most of the time, owners never clean out the inside of their desktop computer, nor have it done.

Hardware components inside the computer, need a steady supply of air rushing over them, to keep their temperature down. The main hardware component that requires this, is the Processor. If the processor becomes too hot, it is turned off. (BIOS program turns it off)

Without the processor running, there is no computer.

The processor has a Heatsink, and Fan, (Sitting on top of the heatsink), to draw away the heat given off by the processor.
The heatsink is a finned piece of metal, attached to a metal base.

As heat is given off from the processor, it is drawn into the base of the heatsink, and radiated out by the fins.
If the fins become clogged with dust, dirt, hair, and other foreign material, the cooling capacity of the cooling system, drops tremendously.

If the fan blades, center hub, and outside cage of the fan, become clogged with foreign material, the cooling capacity drops termendously.

This in turn, allows the processor to heat up beyond it's thermal operating range, and the processor is turned off. This is a Fail Safe option that is built-in, to keep the processor from burning up.

This is also why it is imperative to keep the heatsink, and fan clean.
Solution for this is to remove power to the computer, (Unplug the computer from surge protector), open the computer case, and use a can of compressed air for computers

There is a Thermal Paste compound in-between the Heatsink, and the Processor. This could have dried up.
The bottom of a Heatsink, and the top pf a Processor have rough surfaces. This cannot be seen readily by the Human eye, but can under magnification.

When the two surfaces, (Heatsink bottom, and Processor top), are mated together, there are Air pockets in-between them, or Voids.
The Thermal Paste fills these voids, and allows better heat transference.
Solution for this is to remove the old thermal compound, and apply fresh thermal compound, (Paste)

The rest of the inside of the computer, needs to be kept clean also. Dust and dirt, are 'magnets' for static electricity. Static will fry out delicate computer hardware components. (Can of compressed air for computers)

Also the Power Supply. The Power Supply has it's own fan to keep it cool, and this fan's blades, center hub, and outside cage, need to be clean. The inside of the Power Supply should be clean also. There are heatsinks inside a personal computer power supply.
(Can of compressed air for computers)

The Dell Dimension 2400 has been around for quite a while, in computer rated time. Came out in 2004.
If this is the original power supply, the power supply could be bad.

Electroytic Capacitors may have gone bad. Rectifier bridge, and also IC's.
Solution is to replace the power supply.
Hi.

It looks like over heating problem.

Replace the cooling fan, and ensure that the cooling fan has good adherence to CPU surface, using cooling paste.

If the computer stays on long enough, then you can install and use a software like SpeedFan to measure CPU temperature.

Replace heat sink and fan.

Regards.

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