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PC won't power up


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#1
mike9999

mike9999

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I have a Dell XPS 400 about 6 years old. When I push the power button, it flashes yellow one time and nothing happens. There is an LED on the main board that is on, and the LEDs at the modem connection are working.

Can you please help? Thanks.
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#2
phillpower2

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Hi mike9999

When I push the power button, it flashes yellow one time and nothing happens

Suggests a bad PSU (most likely) or power connection or a bad MB (less likely).

There is an LED on the main board that is on, and the LEDs at the modem connection are working.

This only indicates that the PSU is partially working, a PSU puts out various volts +3.3V, +5V and +12V if one of these is bad the computer will not work.
Your computer has 4 diagnostic LEDs on the front panel what colours are they displaying (if any) if nothing the PSU is the the prime suspect as the cause so if you have or can borrow a known good PSU of the same power output or greater swap that for the present PSU if only for testing purposes, if you need assistance with this let us know.
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#3
mike9999

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Hi, phillpower2

Thanks for the quick response.

The front diagnostic LED lights are not coming on. I'll try swapping the power supply.

Thanks again,

Mike
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#4
phillpower2

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You are welcome :)
The PSU does seem likely then due to there being no error LEDs illuminated.
Good luck and let us know how you get on or require assistance.
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#5
mike9999

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BINGO!

It was the PSU.

Thanks again!
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#6
phillpower2

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Congratulations mike9999 on a successful resolution of your computer issue.
Thank you for choosing GTG, for allowing me to assist and most importantly for posting the solution so that it may help others in the future :) :unsure:
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