Long power-on delay - please help

Morgy · 17 Jul 2009 at 10:20

This past week I have noticed a long delay between pressing the power button of my computer and it actually powering up. After I press it I get nothing for 2, 5, sometimes 10 minutes. Once the fans and lights start it boots as normal and otherwise runs fine. Restarting is no problem either, it's only with powering on. I know that the power button connection is fine because there is no delay if I use it to perform a shutdown.

I'm guessing that the problem is with the PSU, but unfortunately I don't have another build around or a spare PSU to test if this is the case (I'm typing this on my brother's PC, but I don't want to invalidate his warranty).

Is anyone able to offer any advice on this?
I have a Corsair HX620 PSU, a GA-P35C-DS3R mobo and am running Vista 64-bit.
Any help would be much appreciated.

siumatfung · 17 Jul 2009 at 10:36

yeh that psu seems to be packing in recently

however a cheaper alternative would be this

http://www.overclockers.co.uk/showproduct.php?prodid=CA-023-OC&groupid=701&catid=123&subcat=1098

Sammanu · 17 Jul 2009 at 12:43

Sounds to be like the PSU also, try checking the cables to see if there fully connected or not.

westom · 17 Jul 2009 at 13:58

Morgy said:
This past week I have noticed a long delay between pressing the power button of my computer and it actually powering up. After I press it I get nothing for 2, 5, sometimes 10 minutes.

Sounds like the power supply controller - which is completely different from the power supply. Useful answer to your question begins with a 3.5 digit mulitmeter to measure voltages on the purple, green, and gray wires between supply and motherboard both before and when power switch is pressed. Make these measurements by disconnecting nothing. Obtain these signal number when the system does not and does power on.

Morgy · 17 Jul 2009 at 16:12

Thanks for all the replies guys! I lugged it round to my local PC shop who plugged it in to a multimeter and said that it reported undervoltage on 4 out of the 5 rails. New PSU time then it seems, but I'd much rather that than replacing the motherboard.

unknownsock · 17 Jul 2009 at 16:49

Isn't your PSU still in warranty?

Morgy · 17 Jul 2009 at 17:23

Yeah, sorry, when I said 'new PSU' I meant RMA.

westom · 17 Jul 2009 at 20:32

Morgy said:
Thanks for all the replies guys! I lugged it round to my local PC shop who plugged it in to a multimeter and said that it reported undervoltage on 4 out of the 5 rails.

Normal is for a defective PSU to boot a computer. This problem could have existed for quite some time; only finally got bad enough for the computer to fail hard. IOW confirm those numbers on the new PSU to avoid future failures and to identify a defective PSU before its warranty expires.