PSU TEST http://www.duxcw.com/faq/ps/ps4.htm http://www.ochardware.com/articles/psuvolt/psuvolt2.html
If renewing a PSU check:
The physical size of your PSU, some are hard to replace due to being a non standard size.
The amount of power need from the PSU don't skimp.
3 The correct connections for your equipment
- 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:
a) ATX: 6x3.5x5.5", HxWxD. Most common. Uses 4 mounting screws.
b) 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.
c)MicroATX: 5x3x4", HxWxD. Use 3 mounting screws. Not interchangeable with ATX or miniATX.
d) 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 http://www.directron.com/psu.html
Power supply calculator http://www.antec.outervision.com/
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 http://www.videojug.com/film/how-to-install-or-change-my-computers-power-supply http://compreviews.about.com/od/tutorials/ss/DIYPSU.htm
HP and compaq PSU problems guide http://h10010.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&product=3739786&docname=bph06788