Last resort has to be new psu?

  So Afraid 17:14 11 Nov 2008

I have had a problem with bootup for a number of weeks,the pc will now only start ok if i turn off/on
the psu switch a number of times,and then the power button.

Also very strange is that it has to be lay on its side,stood upright i get a blank screen at bootup,and have seen the message

overclocking or overvoltage failed.

I have tested ram,checked graphic card,dust,started without dvd,cdrw drive,checked cables,connectors.

New psu is all i can try or think of.

  Forum Editor 17:44 11 Nov 2008

can be the result of several things, but in your case I tend to agree about the PSU. You mention a list of things that you checked - was the CPU fan one of them?

Check that, and if it's working I would agree about replacing the PSU.

  skidzy 18:03 11 Nov 2008

As above by the FE,also consider the bios.

Have you added any new hardware ?
Such as cpu or new graphics card ?

A bios reset may help,but i tend to psu.

  Fruit Bat /\0/\ 18:21 11 Nov 2008

I once had a machine that would only worked on its side, turned out to be faulty PSU.

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

  So Afraid 20:17 11 Nov 2008

Thanks for the replys.

Calculator says under 400w will be fine.

This is what came with the pc just over 2 years ago.

click here

Its the standard atx psu.

Was thinking of a corsair 450w or hiper 530w.

  So Afraid 20:27 11 Nov 2008

Forgot to say the only other hardware i have installed is 2 x 512mb ram to add to the other
2 x 512mb,so all 4 slots are occupied,and that was 12 months ago.

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