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For the Xperts - Delay Booting PC


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#1 pnjunction

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Posted 15 March 2010 - 06:37 PM

Hey guys, as you can see I'm new around here though I have known about bleeping fo awhile. Just thought I would pick your brains about a weird problem I have.

I have a most peculiar problem I have a machine I built in late 01, ran it for awhile, then upgraded, and it went to my mother who used it for a few years, she upgraded in 08, and I got this machine back. It has been sitting around for over a year, and last week I dusted it off to setup a small file server on my local net.

Everything seemed to go ok when the next morning I woke and turned on that machine and it wouldnt power on. I checked the switches, the ground pins on the header, checked for bad connections etc etc. Eventually I noticed if it sat for awhile it would boot. To make a really long story short, it seems that when I turn the power off at night (kill powerstrip) the machine will not boot for more than 60 mins to less than 80 min. If I shut down the computer and turn it back on it boots right back up everytime. If I turn off the I/O switch on the supply for 5 min and back on it boots ok aswell. If I unplug the power cord from the supply for 5 mins then plug it back in, it boots ok aswell.

Furthermore there is a LED on the board and it takes almost 3 seconds to go out after the power is disconnected. That tells me the caps on the board are good, and I have checked the ripple on the power supply, and it is pretty low, so I dont suspect filter caps, but I am leaning toward a bad supply. It is an early style P4 with the 6 pin aux connector, so if its the problem I will probably repair it as I'm sure they are PNLA, or whoever has any is just waiting for that yokel that MUST have one so they can charge 200 bucks :thumbsup:

Anyway, I would like some input from some other guys who are in the know, what ideas you may have. Meanwhile I'm gonna poke around an see if I can help some peeps ;)

Here are the specs:

Lead Power (generic) 500w ATX supply
Intel (MSI) D850GB
Williamette 1.5G
4 stick rambus
GeForce 3
3com NIC
Syba ATA controller
1 parallel drive
1 serial drive
cdrom
floppy

Just so you know what my technical experience is. I have 25+ yrs computer exp, degree in electronics, worked tech support on site, and on the phone, and various other mechanical, and electromechanical skills. phew! nuff of that.

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#2 hamluis

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Posted 15 March 2010 - 07:46 PM

<<...a machine I built in late 01...>>

How long has that PSU been installed? Sounds like it may be malperforming, IMO.

Louis

You do realize...it's asking a lot for motherboard, CPU, etc...to function well 9 years after purchase.

Edited by hamluis, 15 March 2010 - 07:47 PM.


#3 pnjunction

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Posted 15 March 2010 - 07:49 PM

Its the original PS I built the box with. I cleaned it out after I got it back. That I know of it wasnt doing that before I got it back or after. I has been sitting since dec 08.

edit

yeah I realize that, but it has always been solid.

Edited by pnjunction, 15 March 2010 - 07:51 PM.


#4 pnjunction

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Posted 15 March 2010 - 08:21 PM

I just scoped one of the aux rails (not the mb supply) and the only spikes I have on the 12v is one .15V, and another .1V. Neither is transient. The 5V rail is real clean. I've seen worse on a brand new chiefmax PSU :thumbsup: Nothing smells bad in PS, and I did inspect it for scortching etc when I cleaned it last year. looking inside with a flashlight its still real clean, but I suppose I'm going to have to tear it down and bench it.

Any ideas much appreciated.

BTW when I cleaned it up last year I totally dusted everything, scrubbed the heatsinks, fresh thermal etc etc, basically 'rebuilt' it. Its just been sitting around since then.




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