Help Needed With Pc That Wont Power Up.

Ok peeps hopefully someone can help me out here,

My daughter was using her desktop yesterday morning and wasn't having any problems with it,she decided to do a major clean-up in her bedroom so she disconnected all leads from her pc but on reconnecting every thing well she found that the pc wouldn't power up,i replaced the fuse on the power lead also replaced the power lead with a known working one but the pc still wont power up,as i said it was working fine prior to her removing all leads,im boggled by this so has anyone any ideas any help would be very much appreciated thanks in advance.The PSU was replaced on this machine approximately 8 months ago.

Only thing I can think of moh is last time I encountered this is I took it home and left unplugged for over 24 hours and plugged in and it rebooted no prob. Dunno if it's similar but maybe try out mate.

Cheers Mooley it hasnt been touched since yesterday so ill try and start it up again now.

---------- Post added at 09:26 PM ---------- Previous post was at 09:15 PM ----------

Just tried it Mooley and its a no no, so i just dont know :confused:

try a different outlet, if hooked up to a surge protector try plugging directly into the wall. if that dosn't work then.... bad psu? is it doing anything at all?

I have also connected it into my own pc power source and still nothing homie,maybe as you said im looking at a replacement psu.Its doing nothing homie so i dunno.

I know it sounds strange mate but have you tried to boot up while it's lying on it's side?? There is method in the madness man. Back shortly just gotta run for supplies

Even turned it upside down Mooley still nothing,i may aswell try another psu they are cheap enough but its a good place to start the diagnosis of my problem with the pc.

A lot of motherboards have a power LED fitted, take the side off and have a look to see if it's on (if you have one).

If it's on then you might have a faulty power switch on the case, or the connector is loose on the motherboard.
If you suspect it's the switch, then you can swap it with the reset switch.
(If you don't have an LED it might be worth giving that a bash anyway)

You could also try reseating the ATX supply plug on the mobo.

If those don't work then you're looking at either a dead PSU or mobo.
If the replacement PSU was under £40 then it's going to be the most likely culprit (when it comes to PSU's, it doesn't pay to buy cheap i.e. Welcome to Corsair :: Corsair Cinema ), or a short on the mobo itself (I think that's what Mooley was getting at with lying it on it's side).

Thanks for that Wooster1 im going to go with the psu.

Splurge on something branded with a decent wattage.

Chances are you won't need to go mental on the wattage for an older PC, but I usually think ahead for upgrades and rebuilds, that way I can probably use it for a bit on the next machine.

To give you a rough idea.
I'm using a 550W Xclio Greatpower Modular PSU on a C2D system clocked to 3GHz, that has three hard drives, two optical drives, 4GB of memory, an X-Fi soundcard and an ATI 4870.
I do a lot of gaming @ 1680x1050 and have my HDTV hooked up to the PC (extended display) through the Gfx card as well.
So it's probably fair to say that the PSU gets a good workout on a daily basis (if I put the side on the case it overheats ).

The PSU cost me £50 two years ago, and all it's needed was the occasional blow out with a can of air duster.