It could be the CPU. However, there are a couple of other components to 
check: the data cable to the HD and the case power switch. You likely 
have an extra data cable. The motherboard/case wiring can be temporarily 
reset for testing so that the reset button acts as the power button 
since they are both momentary switches. Also, check that the CPU fan is 
working.

After that comes the CPU, especially if you have to purchase a new one. 
If you can, try the questionable CPU in a known good system.

Merry Christmas!

Tom Mayer

Russ Cox wrote:
> There are no expansion cards and the mouse and keybpard are my test 
> units. Is it likely that replacing the CPU would be the final 
> solution.  I don't think there are any other active elements in the 
> computer after replacing the power supply, motherboard, and memory. If 
> i replace the CPU all the active elements would have been replaced.
>
>> Sorry to have forgotten. It also wiped out the keyboard.
>>
>> Tom Mayer
>>
>> Thomas Mayer wrote:
>>> I ran into a power supply failure that also took out the motherboard 
>>> and mouse.
>>>
>>> Tom Mayer
>>>
>>> Russ Cox wrote:
>>>> I have a Dell Dimension 2400 that was damaged by a nearby lightning 
>>>> hit. No apparent damage but nothing works.  I figured the likely 
>>>> failures in order of probability is: 1. power supply; 
>>>> 2.motherboard; 3. CPU. So I tried another power supply - no 
>>>> success. Then I replaced the motherboard - power light and drive 
>>>> light come on but the HDD doesn't run up. Also replaced the memory. 
>>>> Replaced the HDD, still no success. So the only thing left that I 
>>>> can think of is the CPU.  Is there something else I should check 
>>>> out? I realize this may be an exercise in futility, but it's a 
>>>> learning experience.
>>>>
>>>>
>>>
>>>
>>
>>      
>
>
>

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