PC Powers up and down

[hootch732]

Hi all, my first post so please be kind.

 

I installed an extra usb card into my desktop today and when I switched the pc back on it started to boot and then powered down and then started to boot and powered down again and so on. I removed the usb card and tried again with the same result in powering up and down. Tried the original power supply again and now nothing, help please!

 

The spec is, as far as I am aware:

MS7091 Motherboard

3Gb Processor

1Gb RAM

Win XP SP3

1Gb Graphics Card

 

Thank you.

[Plastic Nev]

Hi Hootch and welcome to Extreme Tech Support - Free PC Help.

 

First, I am a little confused when you said you tried the original power supply, does that mean you have two PSU's ?

 

Whichever it is or both, please can you find the rating(s) from the PSU label, somewhere on it it should tell us what the maximum Watts it is rated for.

 

Also what make and model of USB card is it you fitted so we can find some more about it.

 

It is however not looking good for the PSU at the moment, there could be a fault on the USB card which has damaged the PSU.

 

Nev.

[hootch2732]

Hi Hootch and welcome to Extreme Tech Support - Free PC Help.

 

First, I am a little confused when you said you tried the original power supply, does that mean you have two PSU's ?

 

Whichever it is or both, please can you find the rating(s) from the PSU label, somewhere on it it should tell us what the maximum Watts it is rated for.

 

Also what make and model of USB card is it you fitted so we can find some more about it.

 

It is however not looking good for the PSU at the moment, there could be a fault on the USB card which has damaged the PSU.

 

Nev.

 

Hi Nev

 

Couldnt log in once I logged out so re-registered.

 

I had a spare power supply from the kids old pc and it was 350w like the one I am having problems with, so tried that, but again the pc powered up and down as before and when I decided to try the first power supply again, with fingers crossed, nothing at all happened the pc would not boot up.

 

The usb card was a generic 6 port card.

 

Regards

 

Nick

[Plastic Nev]

Hi Nick, without that USB card installed, do you get any result with either of the power supplies?

Fans starting any lights, or is it completely dead?

On the off chance check the fuse in the plug if you have that type and also check by some other appliance the wall socket is still OK.

 

If all that checks out OK, lets just see if a RAM problem, How many sticks of RAM do you have in there, is it two 500MB or one 1GB?

Remove them both if two, clean the contacts using a pencil eraser, wipe them with a soft cloth then if there are two, just fit one and try, if still nothing remove that one and try the other.

Let us know how you get on with that please.

 

Nev.