Dead PC

  Commander Straker 19:57 02 Sep 2008
Locked

Have an ageing Mesh PC (Athlon XP 1.67/ 768 Mb/ XP SP2). Recently would not start when power button pressed. Cleaned all fans and case interior and checked connections and all was well for a few weeks. Now, once again, the PC will not start up....the Motherboard has a green light showing it is receiving mains and I can get the 'power on' light on the case front to weakly flicker occassionally but nothing occurs. Is this a PSU fault do you think ? Thanks.

  MAT ALAN 20:14 02 Sep 2008

Be a good place to start, easy to swap out and test to eliminate as cause of problem...

  Fruit Bat /\0/\ 21:20 02 Sep 2008

Is this a PSU fault do you think

Yes

Always the weakest point on a Mesh

and classic symptoms of a failed PSU

  Commander Straker 16:33 03 Sep 2008

Thanks guys.....I'll come back if that doesnt work !

  Fruit Bat /\0/\ 16:39 03 Sep 2008

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.

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

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