Help needed, built new pc but will not run

It is either the PSU or the Motherboard. Try a different PSU, if still the same then RMA the motherboard and get a different / same one.

I still say try a diff psu

Thanks guys, I've been looking at those psu testers you can buy, is it worth getting one to test my psu? (cheaper than forking out for a new psu). As I said in an earlier post, I have tested my power supply voltages but only with a meter, therefore it hasn't been under any load, and the voltages seemed ok.

I have a tester and it is worth the money

Cheers Koolpc, will go to my local M*pli*s tomorrow and get one, like I said ,it's gotta be better than buying a new psu and it should let me know if it is a mobo issue.:)

Any particular reason you're staring out the name of shops you're going to?? We're in Hardware section and AFAIK, it's not a crime to say "Maplins" around here??

Also, those PSU testers, surely they're only worth the money if you are building more than one PC, otherwise you buy it once, confirm your PSU is ok, and then what, leave it in a drawer for another 3-5 years?

hmm, maybe its a heatsink fitting incorrectly, that would mean the cpu heats up really quick and to prevent frying it shuts down?

did you use anti-static band or mat when building? hopefully you didnt blow once itty-bity capacitor or something to make it short.

it seems you've tried quite a few things, other than that i'd say have it checked out by someone who can test componants or back to the manufactureres of the parts!

or a really long way, by more companants and build that up, cross check with your old parts, once you know which part is broke replace that, then you have 2 pc's one which you can sell. thats the really long way, but maybe the most satisfying....if it works.

By far the best way to test is to swap the core components. If you can't do that then you really should go to someone who can. It seems that the problem must be around the PSU, mobo or CPU.

freddie's suggestion may have merit - and while we're on that, is the CPU seated correctly? I've only seen three problems which have the symptoms you describe:
1. Buggered PSU
2. Short on the mobo
3. CPU issue (either dead or not fitted correctly)

Thanks again for all your replies and suggestions. I just bought a tester from Maplins tried it and guess what, no -5v. Seems the Vicar has outside influences to guide him! Seriously though folks thanks again for all your comments and I'll post back when I've tried a new psu.
Happy New Year

Glad to have been of help. As the name implies i sure do:).

God bless you vicar and thank you for your help, and everyone else too. As your sig says, Heaven is beautiful but I don't want to see it just yet! :)
Happy New Year

I'm having exactly the same problem as donkiddik, found that on my molex power connectors (and also the 5v rail i assume) the 5v drops to 4v and then the whole psu fails when only powering 2 hdds and a cd drive, not even the mobo!

My PSU is being picked up on monday for an RMA. Initially i thought it was the mobo, so i replaced it at great cost to myself (£28)

Oh and hi, this is my first post. :hexlub:

Hi Krumm and welcome, I'm new here too and am glad I found this site, the members are very helpful and knowledgeable. I've just ordered my new PSU from Scan, a Corsair HX 520W, from what I've been reading it appears to be good.
Happy New Year

cant go wrong the with corsair!

A capacitor is unlikey to be damaged by static the highest risk devices are the CPU and memory (until they are installed) Provided you are reasonably careful (don't wear nylon or sysnthetic clothing while building), handle the mobo by the corners and don't touch the CPU pins or memory connectors, there is little risk of damage.

Beware those cheap PSU testers. While they are good for detecting the presence or absence of a rail (in the absence of a voltmeter) they are not a dummy load - that is, they don't load up the PSU so if there is a fault which causes a rail to shut doewn under high loads - it won't detect that. They are very basic!

Hi Peterb, I know about the tester being very basic as I tried a little experiment once the psu was running. I connected my case fans (4) on low speed and increased them to full speed one by one, suffice to say when I put the last one onto full speed the psu shut down, confirming more than one fault with my psu. I'm just waiting for my new corsair HX520 to arrive and hopefully all will be well.