Unique power supply problem...

HardWired

Senior member
May 10, 2000
598
0
76
I didn't get a single bite when I posted this in the Tech. Support forum yesterday so I thought I'd post here. Heres a copy/paste of my original post:

A brief description of how this problem manifested itself from my 13 year old daughters point of view. The wireless mouse lost connection with the base unit and she couldn't figure out how to get the mouse and the base to link up (yes...I know how, but wasn't home) so she thought a reboot might do it. Since she didn't have mouse control and didn't know how or didn't think to use the keyboard to shut down Windows properly, she held the case power button in for well over 5-10 seconds but it wouldn't power down so she reached in back and pulled the plug from the power supply. No biggie, right? Well, she plugs it back in to boot up but now when she pushes the power button on the case theres 's no response. Just a cold dead case. Thats her story and next is what I've ascertained from a few minutes of troubleshooting.

The MB is in fact getting power from a fairly new Antec TP 500 because the green power indicator light on the MB itself (Asus P4PE...I know, pretty old) is coming on and staying on when the PS is turned on. And it goes off accordingly when turning off or unplugging the PS. So that also tells me it's not the PS itself otherwise I'd get no power indication on the MB at all.

With that in mind, I'm now thinking the power switch on the case either came loose (wires) or simply died. I checked it to the pins on the MB and then back to the switch and all was good. Since the connections are good, I'm now thinking the switch died. So I did the ol' switch-a-roo with the reset switch (using it as a temp. power switch) thinking my problem was solved.... but that was a no go. What are the odds of both switches failing at the same time. I know.....extremely unlikely.

So now I'm left to ponder if it's not the power switch on the case, maybe just the switching components (leads, transistors, caps, etc.,) on the MB itself failed, leaving me w/ a MB that looks like its getting power but in fact will not power up.

I hope thats a clear enough explanation of my problem. I've been building my own rigs (and now my kids w/ my old parts) since 1993 and consider myself well above average when it comes to PC hardware/software configuration and troubleshooting, but this one has got me stumped.

Anyone run in to anything similar? Any constructive comments/suggestions would be appreciated.

Thanks!

 

Atheus

Diamond Member
Jun 7, 2005
7,313
2
0
I would try to get the machine to power up by using a screwdriver instead of a switch, failing that, can you get the PSU to power up outside the case by shorting the green and black wires?
 

myocardia

Diamond Member
Jun 21, 2003
9,291
30
91
Leave the psu unplugged for awhile, and hold the power button down, after unplugging it, to empty the capacitors. I don't know about your particular psu, but alot of them have breakers, that won't reset unless they're left unplugged for ~30 min-1 hour.
 

Duvie

Elite Member
Feb 5, 2001
16,215
0
71
Originally posted by: myocardia
Leave the psu unplugged for awhile, and hold the power button down, after unplugging it, to empty the capacitors. I don't know about your particular psu, but alot of them have breakers, that won't reset unless they're left unplugged for ~30 min-1 hour.



Exactly...this just worked on my parents PC the other day after a surge shut the system down....


Also the screwdriver (flathead) method by touching the 2 pins associated with the power switch should rule out the case power switch theory...
 

Seekermeister

Golden Member
Oct 3, 2006
1,971
0
0
I would haven't responded, because I wouldn't want to be thought of as a geek, but putting that aside, I will say that I have an Antec SP500. And I have noticed that when I switched off the switch on the back of the case to install some ram, that at first it would not power up when switching it back on. I'm not sure what happened, because after about a minute, it went ahead and booted normally without doing anything. If it were me, I would repeat the process and exert some patience, before going deeper.
 

Auric

Diamond Member
Oct 11, 1999
9,596
2
71
I concur with the PSU breaker switch hypothesis and 'twould be the first thing to check from my experience with power outages. Cycle its switch and that of any power bar (some may sport an independent button for that). A time element has not been an evident factor in my experience but could have been sassifed by the duration of aforementioned power outages.
 

Atheus

Diamond Member
Jun 7, 2005
7,313
2
0
Originally posted by: Seekermeister
I would haven't responded, because I wouldn't want to be thought of as a geek

LOL, this is Anandtech you spoon, what are you doing here if you're not a geek
 

Nocturnal

Lifer
Jan 8, 2002
18,927
0
76
It could be the motherboard. I was getting power on my ASUS board with the green light yet it still wouldn't turn on at all even with a new PSU.
 

oynaz

Platinum Member
May 14, 2003
2,448
2
81
Doesn't your mobo have some sort of LED which tries to tell you what is wrong by blinking at you?
 

HardWired

Senior member
May 10, 2000
598
0
76
Thanks for the responses y'all. Some good info. I've been working 12 hr days and 14 hrs total away from the house so further tinkering will have to come this weekend. But let me respond to some of the tips above at least.

I would try to get the machine to power up by using a screwdriver instead of a switch
Never tried that before. I'll give it a shot.

Leave the psu unplugged for awhile, and hold the power button down, after unplugging it, to empty the capacitors
Tried that...no good.

It could be the motherboard. I was getting power on my ASUS board with the green light yet it still wouldn't turn on at all even with a new PSU.

I'm thinking this might be the case more and more. It IS getting power though because not only the green light indicator, but when I unplug or switch off the PS on the back, the green light fades out hear that little electronic wince type noise that you hear when the power fades/drains away. Anyone else heard that noise before? It's very faint.

Doesn't your mobo have some sort of LED which tries to tell you what is wrong by blinking at you?

Nope. Newer boards do but this one is getting pretty old. I have another P4PE in my box-o-parts thats mothballed because the 2nd IDE channel died, but other than that it runs fine. This weekend I'm going to tinker only for a very short time then swap with the other MB I have. If that gets power and boots fine I'll consider this current MB as ready for the trash can buy a cheap PCI IDE card to make up for the dead channel on this replacement relic so I can still accommodate all of her drives.

I'll let you know. Thanks for all your input.
 

151528

Senior member
May 26, 2006
211
0
0
why dont u try the psu with another of your old systems?, ive been able to sort out every problem ive had with my pc's by just testing each part in another setup [unless i know the solution already]
 

151528

Senior member
May 26, 2006
211
0
0
Originally posted by: Atheus
Originally posted by: Seekermeister
I would haven't responded, because I wouldn't want to be thought of as a geek

LOL, this is Anandtech you spoon, what are you doing here if you're not a geek

and his little pic isnt the best choice if he doesnt wanna look like one either, lol
 

timotl

Junior Member
Mar 18, 2006
5
0
0
I would doubt a power supply issue since holding the power button did not shut the system down.
I have seen motherboards fail this way before.

You could try turning on the power supply directly (grounding green wire) while still plugged into the motherboard.
Might power up fine, might make a pretty fireball.....

On second thought, just replace the board.

-timotl
 

NogginBoink

Diamond Member
Feb 17, 2002
5,322
0
0
It could very well be a power supply problem. Just because you're getting standby voltage doesn't mean all of the other parts of the PSU are working.

Buy an ATX PSU tester, or take the PSU into the local computer shop for testing.
 

Operandi

Diamond Member
Oct 9, 1999
5,508
0
0
Originally posted by: NogginBoink
It could very well be a power supply problem. Just because you're getting standby voltage doesn't mean all of the other parts of the PSU are working.

Right, try a known working PSU.
 

Seekermeister

Golden Member
Oct 3, 2006
1,971
0
0
Originally posted by: Atheus
Originally posted by: Seekermeister
I would haven't responded, because I wouldn't want to be thought of as a geek

LOL, this is Anandtech you spoon, what are you doing here if you're not a geek
Is a spoon worse than a geek? Just consider me an apprentice geek.
 

Seekermeister

Golden Member
Oct 3, 2006
1,971
0
0
Originally posted by: 151528
Originally posted by: Atheus
Originally posted by: Seekermeister
I would haven't responded, because I wouldn't want to be thought of as a geek

LOL, this is Anandtech you spoon, what are you doing here if you're not a geek

and his little pic isnt the best choice if he doesnt wanna look like one either, lol
Being old doesn't necessarily make a person a geek. Besides, since I couldn't use my own avatar, that's the best I could do.

 

So

Lifer
Jul 2, 2001
25,921
14
81
Originally posted by: Seekermeister
Originally posted by: Atheus
Originally posted by: Seekermeister
I would haven't responded, because I wouldn't want to be thought of as a geek

LOL, this is Anandtech you spoon, what are you doing here if you're not a geek
Is a spoon worse than a geek? Just consider me an apprentice geek.

If you have an account here, you're a geek, by definition. Learn to love it.
 

Seekermeister

Golden Member
Oct 3, 2006
1,971
0
0
Originally posted by: So
Originally posted by: Seekermeister
Originally posted by: Atheus
Originally posted by: Seekermeister
I would haven't responded, because I wouldn't want to be thought of as a geek

LOL, this is Anandtech you spoon, what are you doing here if you're not a geek
Is a spoon worse than a geek? Just consider me an apprentice geek.

If you have an account here, you're a geek, by definition. Learn to love it.
Yeeks! Marked for life!
 
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