My sons PC is down... Help

[Duke{CLR}]

My son has a HP Pavilion m9426f HP Pavilion Elite m9426f Desktop PC Product Specifications HP Pavilion Elite m9426f Desktop PC - HP Customer Care (United States - English)

It will not power up at all, there is a little green led on the back of the PSU that blinks but thats it. No fans in the PSU, mb case... nothing.

I checked the interior connections.
I removed the switch and it looks OK but who knows. (I thought about shorting the wires but I haven't tried that yet.)

I suspect the PSU may be dead and I found one for $73.00.

I thought about trying another PSU but I don't think it will fit, in addition I have read where HPs can have the power pins different on the MBs they use.

I then looked into a new PSU, MB, case which could be upgraded down the road or used for a HTPC. I came up with this parts list for $139.00 but it does not include a copy of the OS which I think I would need.

Newegg.com - COOLER MASTER Centurion 534 RC-534-KKRK-GP Black Aluminum SECC Chassis ATX Mid Tower Computer Case 460W Power Supply
Newegg.com - GIGABYTE GA-G41M-Combo LGA 775 Intel G41 Micro ATX Intel Motherboard

What would you pros do?

[baconoclock]

My son has a HP Pavilion m9426f HP Pavilion Elite m9426f Desktop PC Product Specifications HP Pavilion Elite m9426f Desktop PC - HP Customer Care (United States - English)

It will not power up at all, there is a little green led on the back of the PSU that blinks but thats it. No fans in the PSU, mb case... nothing.

I checked the interior connections.
I removed the switch and it looks OK but who knows. (I thought about shorting the wires but I haven't tried that yet.)

I suspect the PSU may be dead and I found one for $73.00.

I thought about trying another PSU but I don't think it will fit, in addition I have read where HPs can have the power pins different on the MBs they use.

I then looked into a new PSU, MB, case which could be upgraded down the road or used for a HTPC. I came up with this parts list for $139.00 but it does not include a copy of the OS which I think I would need.

Newegg.com - COOLER MASTER Centurion 534 RC-534-KKRK-GP Black Aluminum SECC Chassis ATX Mid Tower Computer Case 460W Power Supply
Newegg.com - GIGABYTE GA-G41M-Combo LGA 775 Intel G41 Micro ATX Intel Motherboard

What would you pros do?

Since it doesn't even boot or post to bios I would put money on it being the PSU. Funny thing is I had a power supply go out a couple months ago and it was the same thing you describe. A LED was lit up on the PSU so I thought 'nah, its lit the power supply couldn't have failed. ' Ordered some parts (funny thing is i have an extra PSU now ) and sure enough it was the PSU.

Looking at some pics i could find online that looks like a normal-sized power supply. I also ran across a couple blog posts of people fixing their own and they all said ' I just ordered a new power supply from xxx.' Here is one as an example. I would just order another off of newegg and if HP does indeed use special pins just return it to newegg or find some adapters.

[Duke{CLR}]

I'm leaning that way too bacon.

[Devilguns]

I'd say it's the psu as well.

[Duke{CLR}]

So now the question is do I order the one form HP or do I try to fit another PSU into the HP case and hope the MB is wired the same.

[baconoclock]

So now the question is do I order the one form HP or do I try to fit another PSU into the HP case and hope the MB is wired the same.

I would try to fit another in, it looks like a normal PSU size.

[Devilguns]

The mobo should be wired the same. At work I replaced the psu in two hp's that were around six years old and everything was standard.

[Duke{CLR}]

OK, I'll get a PSU and give it a shot.

[Donziboy2]

Last time I looked PSU plugs are standard, there is only 2 types, 20 pin and 24 pin, but there are also pins for cpu/extra mobo voltage. Most decent psu's have a combo plug that has the last 4 pins removable.

Sizes are also pretty standard but there are exceptions, some are thinner or longer then others.

If your up to it you can always hitwire the psu outside the case and see if it powers up.

How to hotwire a PSU
Even though they have a disclaimer saying you cant hurt yourself, they are fools, you can shock the berry's off a toad so be careful if you do it

[Duke{CLR}]

How to hotwire a PSU
Even though they have a disclaimer saying you cant hurt yourself, they are fools, you can shock the berry's off a toad so be careful if you do it

Lol I think I'll just try out a new PSU, no need to add myself to a list of Darwin award winners.

[juneau]

Last time I looked PSU plugs are standard, there is only 2 types, 20 pin and 24 pin, but there are also pins for cpu/extra mobo voltage. Most decent psu's have a combo plug that has the last 4 pins removable.

Sizes are also pretty standard but there are exceptions, some are thinner or longer then others.

If your up to it you can always hitwire the psu outside the case and see if it powers up.

How to hotwire a PSU
Even though they have a disclaimer saying you cant hurt yourself, they are fools, you can shock the berry's off a toad so be careful if you do it

Sadly these bigname prebuilt systems usually come with proprietary connections on the PSU and motherboard to force you to use their support. Dell used to be a biiiiiiiiiiiiiig player in that game however i believe they no longer do it.

Dont you have a spare PSU lying around Duke? Saves buying one to test with.

[BadHabitz]

Did you try using a different power cord? It's always the first thing I do when I have power problems. It's cheap and easy (you probably have a few of them around) and you narrow it down a little.
I'd hate to spend over $80 on a new PSU only to find out that it was just a short in the cord, so it's the first thing I exclude from the list of possibilities.

[Duke{CLR}]

Because of the led on the back i thin the cord is OK. I'm going to looks at Staples tomorrow and see if they have one that isn't too expensive. I also looked at the connections and they seem to be the same, if it doesn't fit I'll just return it.

[Infamous]

a buddy of mine gave me an old HP to use for parts to get my rigs back up and running. a lot of the pavillions had a low end asus mobo in it.

Most power supplies for towers are standard size, and the pins as well. i am very nervous about what to plug into what, and more than not, pins are lined up in such a way, they can not go into the wrong place. ( notice on the plastic pins holders, there are squares and trapezoid shapes, only fit into where they fit, at least in all my experience with hardware)

[BadHabitz]

Because of the led on the back i thin the cord is OK.

Still, it is still possible. Just because there might be a problem with the cord doesn't mean it'll be blacked out.