Dead desk top computer

  johnincrete 09:25 AM 18 Jun 11

Some weeks ago, nothing happened when I switched on my computer & there were none of the usual lights. I took it for repair and when the shop connected it, it booted up as though nothing had happened. So I bought a new power cable. Its happened a few times since but, until now, eventually it booted OK. Now it is dead! I connect the power lead to the screen and it worked so it's not the power into the computer that is the problem. Here in Crete, the computer "experts" tend to be quite "macho" and will try all sorts of things to mend something. I want to have some ideas of what might be wrong before I take it in.

Can anyone advise me please.

e.g. is there any way I can test the power supply and, if I find it duff, is it the sort of replacement a person with limited knowledge could do?

  Fruit Bat /\0/\ 14:23 PM 18 Jun 11

Probably 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:

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

  1. Power supply calculator

  2. 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

HP and compaq PSU problems guide

  onthelimit1 14:27 PM 18 Jun 11

John - if it's a standard size tower, changing the PSU takes 5 mins, it's that easy.

  johnincrete 07:31 AM 19 Jun 11

Thanks Fruit Bat Testing is beyond me but the info will allow me to buy a new PSU - I did not mention in my post that there was no cooling fan or beeps when I switched on. I'll follow the many links you supplied to educate myself, then I'll open the box & see where the PSU is and if there are identifiers that will help to make the choice. I'm very greatful for the time & effort you have put in to help me.

  johnincrete 07:59 AM 21 Jun 11

Opened the PC & PSU is in a big box & I could not see where the fixings are. Gave up! Took PC to a recommended technician. Charged 35euro (about 30 pounds)Said they found a problem but PSU was OK. They gave it a good clean. Came home, connected it and guess what - nothing happened. I was holding the power connector while pushing the "on" button and it worked! Obviously the fault is with the connector (the cable is new).

Can anyone tell me if the connector is part of the CPU. If it is, is it likely that it is reparable or does it mean a new PSU. Meantime, I will gaffer-tape the cable so that there is no strain on the connector.

  wee eddie 10:08 AM 21 Jun 11

Just a thought ~ There is a possibility that your Socket is experiencing an intermittent supply.

A simple check for this is to have a lamp, connected to the same socket using a 2 plug Adaptor, that is switched on at the same time as the PC.

  johnincrete 08:43 AM 22 Jun 11

wee eddie Screen, speakers, printer all connected to same socket & exhibit no probs

Thanks all the same

  johnincrete 08:49 AM 22 Jun 11

New problem Left computer running loading video from camcorder. When returned, screen showed message: X300 SE 128MB BIOS P/N 113-A33406-100 on black background. Could here something running in the PC (?fan) but computer dead with no response to Ctrl-Alt-Delete. Used power button to switch off, waited then powered back on. Same error almost immediately. Put Acronis recovery disk in drive, switched off & then back on. Green lights on disk drives & the one with the disk was spinning but same error. Repairer from last time who failed to mend the power connector says it is the video card. Any suggestions?


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