Re: No power despite new PSU
What psu did you buy? (Make, model)
Re: No power despite new PSU
It's a SumVision PowerX one - Cheap I know and I know I shouldn't skimp on the PSU but this is for fault finding purposes only and it should certainly be ample to power up the rig with no HDDs, DVD writer and fans attached to it (so just mobo, cpu, gfx and ram).
Re: No power despite new PSU
Quote:
Originally Posted by
finnrogers
It's a SumVision PowerX one - Cheap I know and I know I shouldn't skimp on the PSU but this is for fault finding purposes only and it should certainly be ample to power up the rig with no HDDs, DVD writer and fans attached to it (so just mobo, cpu, gfx and ram).
I would go so far to say that even for 'fault finding purposes' a cheap psu is not recommended. It could end up causing more problems.
However it could be the motherboard that's causing problem, the only way to confirm is to get a proper psu and test it again. Can you borrow one from a friend?
Also what psu were you using before?
And do any motherboard lights come on when you turn the psu on?
Re: No power despite new PSU
Nope, no lights (not that there is any AFAIK) - Can't borrow a "proper" PSU, but seriously, it's cheap but it's up to the job... it meets all the power requirements in terms of voltage, rails, etc... and I'm not overloading it at all so I'm pretty sure it's not the problem.
My previous PSU was a Enermax Liberty 400W.
Re: No power despite new PSU
Well if you have no way to test the new psu, it could be faulty. I know its a small chance. You could buy one of these and see it the PSU would power up e.g. fans.
Re: No power despite new PSU
Odd that not even the PSU fan spins. Assuming you have checked the mains fuse in the plug (and there is power to the mains socket) then you need to check that the power button is actually working - and plugged in correctly to the mobo. If you can add some load to the PSU, you can short the appropriate wires together on the PSU output to force it to start. (PS start and ground - see the link) Car indicator bulbs (or the old style headlamp bulbs) make good dummy loads.
http://www.helpwithpcs.com/courses/p...nc-pinouts.htm
Or if you have another computer, try the PSU ion that.
If the pSU is OK, then it is back to standard fault finding - strip it down, start with minimum components, and build it up part by part.
Re: No power despite new PSU
Quote:
Originally Posted by
!TIMMY!
Well if you have no way to test the new psu, it could be faulty. I know its a small chance. You could buy one of
these and see it the PSU would power up e.g. fans.
or use a paper clip http://www.metacafe.com/watch/729606...er_supply_psu/
Re: No power despite new PSU
Thanks, I'll try the paperclip trick to make sure the new PSU works. Will be very surprised if it doesn't...
Re: No power despite new PSU
yep - both old and new PSUs work fine using the paperclip... can't see any problem with the power switch on the case so I'm thinking dead mobo?
Re: No power despite new PSU
Did you plug in the 12V cpu line? That one always gets me!
Re: No power despite new PSU
yeh definately all plugged in fine. Tried both PSUs last night, fiddled with the power switch too (actually pulled it off the front panel of the case - it was just attached by a clip) made sure this was definately plugged in properly onto the motherboard.
Incidentally, I plugged all my other components in too and using the paperclip method they fire up with the PSU with no problems so at least I know they are not fried.
Re: No power despite new PSU
Follow the lead from the power switch to the motherboard - identify which two pins it connects to and bridge these with a screwdriver (very carefully) to see if it powers up normally?
Re: No power despite new PSU
can also try a bios reset, ive only seen it happen once due to bad bios though
Re: No power despite new PSU
Quote:
Originally Posted by
GoNz0
can also try a bios reset, ive only seen it happen once due to bad bios though
It won't boot, so he can't do anything with the BIOS. (Except replace it - if it is plug in). And even if the BIOS was corrupted, there should be some activity, even if it is only fan operation.
Re: No power despite new PSU
Quote:
Originally Posted by
dangel
Follow the lead from the power switch to the motherboard - identify which two pins it connects to and bridge these with a screwdriver (very carefully) to see if it powers up normally?
Dangel, thanks, I'll give that a try. It hadn't occured to me to try that actually but still, I don't really hold a great deal of hope on this working.
Re: No power despite new PSU
Quote:
Originally Posted by
finnrogers
Dangel, thanks, I'll give that a try. It hadn't occured to me to try that actually but still, I don't really hold a great deal of hope on this working.
Well you never know - something as simple as a broken switch would actually be rather nice! It's only a momentary switch btw - so the contact is broken once you release the button.
Re: No power despite new PSU
No joy :-(
Ordered a new mobo (same one again) from flea-bay Hong Kong (only one I could find) - it has a warranty though this time at least.