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Tech Helproom

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Ye Olde PSU problem


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After getting a new PC a three years back I put my old MESH machine into the cupboard and forgot about it until now. Having decided to upgarde my current machine to Windows 7, I want something to use whilst I do this, as knowing my luck this will not be as straight forward as it appears to be! The problem is it appears the PSU has blown on the old machine. It worked to start with, though I did have to put a new battery on to the MoBo. Then I tried to turn the PC on and nothing happened. There is a whine that comes from the PSU, when it is turned on, but that is all, the fan doesn't start. This PSU is rated at 350 watt max. Part of the problem also is that its not a SATA HDD, the HDD is an IDE which I understand uses a different connector. The PC has two disk drives connected, also a floppy drive (not too bothered about this, haven't had a floppy in this house for years) Can anybody recommend a PSU that will suit my purpose, I dont want to make an expensive mistake! Another thing that has occurred to me is that the power switch on the front of the PC maybe at fault. Is there any easy way for me to check this out?

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KRONOS the First

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How long do you think that upgrading your current PC is going to take that you need to upgrade an old PC whilst doing this?

I would in regards to your PSU perhaps remove it from the PC and clean the fan but you should be able to replace it extremely cheaply from EBay. The power button a PC is a fairly simple device there is very little that can go wrong with them, you can check te connections either end but not much else.

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Check what's on the original PSU label, and get a similar replacement as previously mentioned from eBay. For about the same price or a pound or two difference you should be able to uprate to 500w, so go for that or slightly bigger.Make sure that the fixing bolt locations are the same as the original.

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Fruit Bat /\0/\

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PSU TEST http://www.duxcw.com/faq/ps/ps4.htm http://www.ochardware.com/articles/psuvolt/psuvolt2.html

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 http://www.directron.com/psu.html

2. Power supply calculator http://www.antec.outervision.com/

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 http://www.videojug.com/film/how-to-install-or-change-my-computers-power-supply


HP and compaq PSU problems guide http://h10010.www1.hp.com/ewfrf/wc/document?lc=en&dlc=en&cc=us&product=3739786&docname=bph06788

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"the power switch on the front of the PC maybe at fault. Is there any easy way for me to check this out?"

Yes. Find which pins on the motherboard that the cable from the power switch connects to, then just short them out using a screwdriver or something similar.

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