Dell Dimension 8400 won't boot

  sppears 10:53 04 Sep 09
Locked

Sometimes it will boot but freezes up. Most often it fails, the power button remains orange and the hard drive light comes on faintly for a short time. Nothing more happens and the monitor light stays orange.
The fan works (sometimes runs fast) and the cd drive lights flash as normal. None of the four lights on the back are on.
The light on the modem is on.
I am pretty clueless about computers, any ideas please?

  Sparkly 11:04 04 Sep 09

Take a look hear
click here

  Fruit Bat /\0/\ 14:17 04 Sep 09

Sounds like power supply unit is dying

Can you try one from another machine?

If renewing a PSU check:

1. The physical size of your PSU, some are hard to replace due to being a non standard size.
2. The amount of power need from the PSU don't skimp.
3 The correct connections for your equipment

1. Physical Dimensions

Besides the specs and form factors, the physical dimensions are also important factors in selecting a compatible power supply. Here is an outline of the physical dimensions of most standard power supplies:

# ATX: 6x3.5x5.5", HxWxD. Most common. Uses 4 mounting screws.
# Mini-ATX: 5x3.5x5", HxWxD. Rare size. Uses 4 mounting screws. Can be used in a regular ATX case, but often not the other way around.
# MicroATX: 5x3x4", HxWxD. Use 3 mounting screws. Not interchangeable with ATX or miniATX.
# Flex ATX: Even smaller than Micro ATX. Various sizes according to case specs; often not interchangeable.

Use the data above to determine if a particular power supply would fit your case.

The quality of a power supply can be estimated by its weight. While this is not a true scientific or thorough measurement of the power supply reliability, it is nevertheless a very simple and easy way for ordinary PC users to estimate and compare the quality of a power supply. Why weight matters click here

2. Power supply calculator click here

3. Correct connections
Some boards have 20 pin connectors others 24 pin
There is often a 4 pin plug required to power Intel CPUs
Molex D plugs for IDE HDD and CD/DVD drives
SATA power connections for latest HDDs and DVD drives.


Guide to changing PSU
click here
click here

  sppears 14:22 04 Sep 09

Thank you, that's very helpful.

  sppears 09:37 25 Sep 09

Just to update the problem was a failed motherboard.
It has been replaced and all is now ok.
The repair shop also first thought it might be the PSU but replacing it made no difference.

  Fruit Bat /\0/\ 10:14 25 Sep 09

Thanks for the feed back

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