Computer not turning on.

Andy_1995 · 8 Jan 2012 at 15:52

I have just finished fitting my components into a new case, but I have a problem. When I tried to turn it on it did not start all of the cables are in the correct place including the power switch.

I have tried everything to start it up I have even re-wired all the cables and yet there is still no result.

If anyone could help me solve this problem it would be appreciated.

Addicted · 8 Jan 2012 at 15:53

PSU switch definitely on? definitely got the Power switch the right away and in the right place etc?

Defy Belief · 8 Jan 2012 at 15:54

Where are you turning it on, have you tried turning it on at the mobo?

Andy_1995 · 8 Jan 2012 at 16:01

yes the psu switch is on and the power switch is the right way.

I have also tried turning it on by the mobo but still nothing.

RJC · 8 Jan 2012 at 16:06

What is the make / model of the psu?

One way is to double check the PSU is to link the Pins on the main 24 pin ATX connector using a paper clip.

Remove all power connections to the board, connect a fan to one of the molex connector form the PSU, on the main 24 Pin ATX connector remove the the extra 4 pins so your left with 20, and link out pins 13 & 14 (green & black) with a paper clip or wire. Switvh the PSU back on at the mains and it should start and the fan connected to the molex should run.

SMed · 8 Jan 2012 at 16:07

I'm experiencing something similar. What do you mean by turning it on at the mobo? As in without the case power switch? I've seen how to turn the PSU on without the mobo, but everything is installed and if I can do it with the mobo installed this would be better.

Andy_1995 · 8 Jan 2012 at 16:14

There is nothing wrong with the psu, when I tried to turn it on again there it didn't turn on but it did start the front fan then suddenly stopped.

Defy Belief · 8 Jan 2012 at 16:17

SMed said:
I'm experiencing something similar. What do you mean by turning it on at the mobo? As in without the case power switch? I've seen how to turn the PSU on without the mobo, but everything is installed and if I can do it with the mobo installed this would be better.

a lot of mobos have a 'start' button on them so you can boot the computer via the motherboard rather than the button on the case.

Andy_1995 · 8 Jan 2012 at 16:22

I do not have a start button on my mobo for it is quite old so I do not have that option to try.

SMed · 8 Jan 2012 at 16:37

Defy Belief said:
a lot of mobos have a 'start' button on them so you can boot the computer via the motherboard rather than the button on the case.

Thanks, but I was being an idiot. My 24(20?) pin cable wasn't pressed in all the way.

Missing a mobo standoff there so the board was flexing. All's good.

Addicted · 8 Jan 2012 at 16:39

SMed said:
Thanks, but I was being an idiot. My 24(20?) pin cable wasn't pressed in all the way. Missing a mobo standoff there so the board was flexing. All's good.

epic facepalm :d glad you got it sorted, i hate that feeling you get when you've just finished rebuilding and it doesn't do anything!

Defy Belief · 8 Jan 2012 at 16:42

Addicted said:
epic facepalm :d glad you got it sorted, i hate that feeling you get when you've just finished rebuilding and it doesn't do anything!

Try fiddling with cables for 25 minutes, checking every connection and then looking at the plug in the wall for it to be off, doh.

SMed · 8 Jan 2012 at 16:44

Addicted said:
epic facepalm :d glad you got it sorted, i hate that feeling you get when you've just finished rebuilding and it doesn't do anything!

lol But the feeling you get when it was a easy simple fix almost makes it worth it.

wazza300 · 8 Jan 2012 at 16:46

Getsum standoffs under your board,not only does it earth it,it stops mb from flexing and fracturing the copper traces inside the mb which can lead to missing memory and lots of other problems

SMed · 8 Jan 2012 at 16:48

wazza300 said:
Getsum standoffs under your board,not only does it earth it,it stops mb from flexing and fracturing the copper traces inside the mb which can lead to missing memory and lots of other problems

I think it's my case though. There doesn't even seem to be a hole on the tray there. It's an Antec 300. I've got plenty of standoffs though, I should probably drill a hole I guess.

Andy_1995 · 8 Jan 2012 at 16:54

I have just tried my psu in another computer and it worked fine, so that is no the problem.

I am beginning to think it is either the power button faulty or my motherboard may have broke I will continue trying everything.

TNGL · 8 Jan 2012 at 16:57

Have you tried taking the components out of the case, and then booting from there by shorting the pins on the motherboard to manually start it? Your case may be shorting something.

Andy_1995 · 8 Jan 2012 at 17:02

I was going to re-fit my components into my old case and see if it would start. If it did start then it must be the case or something I have done wrong but haven't noticed lol.

Socrates470BC · 8 Jan 2012 at 17:09

Try an out of case assembly as Paul does in this video.

SouthEastBlue · 8 Jan 2012 at 17:43

May I ask what case it is you have? I know with the Zalman Z9 the power wire to the case button has it's own connector near the button end that has caused issues with a few people not being able to boot their system due to it being disconnected.

You can also illiminate the power button from being the problem by attempting to boot the system using a screwdriver to carefully touch the pins that wire up to the power wire too.