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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.
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 agree...new psu.
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
Thanks for the replys.
Calculator says under 400w will be fine.
This is what came with the pc just over 2 years ago.
Its the standard atx psu.
Was thinking of a corsair 450w or hiper 530w.
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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