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Computer starts then dies,MB power light stays on.

by grwilson / September 19, 2006 10:24 PM PDT

I have an AMD Athlon based computer with two hard drives & two optical drives,when I start it up sometimes it fails to even boot up because everything in the system goes off except the MB power light.If I do get it started it will die anywhere from 5 to 10 minutes later again only leaving the MB power light on.I suspect the no name power supply but I would like some feedback to see if I'm right in the direction of my thinking,Thanks.

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Tell if you checked...
by R. Proffitt Forum moderator / September 19, 2006 10:29 PM PDT

And what you checked.

Sometimes the heatsink falls off, a fan dies or other.

The symptoms are typical of heat issues.

Bob

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I checked
by grwilson / September 19, 2006 10:52 PM PDT
In reply to: Tell if you checked...

All fans are running and the heat sinks are intact,every thing starts running but the PC doesn't even have a chance to boot and like I said if it does start 5 or 10 minutes later it just goes dead no blue screen just black and all that's left is the green light on the MB!

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What can be removed?
by R. Proffitt Forum moderator / September 19, 2006 11:01 PM PDT
In reply to: I checked

Since it's dead after that, you could reduce what's in the box. No hard disks, CD/DVD drives and one stick of RAM. By downsizing the machine to bare essentials you might sniff out what parts are suspect.

You didn't detail what the machine is made of so I can't tell if it's in the time period of BAD CAPS. Any bulging caps is a sign too.

Remember that others can only comment based on what you reveal so the more detail the better.

Bob

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Some Specs
by grwilson / September 19, 2006 11:48 PM PDT
In reply to: What can be removed?

Athlon 2600+
1 GB DDR Ram
16x DVD drive
16x DVD writer
ATI All in Wonder 256mb 2006 edition
ASUS A7V 600-X MB
3 case fans
unused 56k modem
soundblaster live

note all caps in the MB look alright and this problem happens even with the PC ice cold again the only sign of any life is the green light on the MB

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What can be removed?
by R. Proffitt Forum moderator / September 19, 2006 11:58 PM PDT
In reply to: Some Specs

I didn't see any response to that question or if you took steps to downsize the machine.

It's the classic PC troubleshooting method to remove parts till the machine works. This way it reduces the possible amount of bad parts.

If you were hoping to figure out what's failed just by symptoms you won't like my answer. I think it's best you downsize your way to the answer.

Bob

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Finally did what you said
by grwilson / September 20, 2006 12:21 AM PDT
In reply to: What can be removed?

Well I did it I disconnected the components one at a time including memory and I even hooked up a spare power supply I had ,still all I get is a slight twitch of the fans and the green light on the Motherboard I guess it's probably the MB itself unfortunately.

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Are the IDE cables unplugged?
by R. Proffitt Forum moderator / September 20, 2006 12:57 AM PDT

I can cause it to twitch if the cables have an issue.

Since it only twitches we can keep removing parts till it powers up. We can go all the way down to just the PSU in fact.

Bob

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totally disconnected
by grwilson / September 20, 2006 1:45 AM PDT

Yes I'm down just to the PSU and MB still no response
just the green light on the MB even the floppy is disconnected

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The CPU too?
by R. Proffitt Forum moderator / September 20, 2006 2:06 AM PDT
In reply to: totally disconnected

I had one fried AMD and that did similar.

Bob

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CPU out
by grwilson / September 20, 2006 2:14 AM PDT
In reply to: The CPU too?

with the CPU out same thing no response just the light on the MB

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Now the Power Supply test.
by R. Proffitt Forum moderator / September 20, 2006 2:22 AM PDT
In reply to: CPU out
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spare power supply
by grwilson / September 20, 2006 2:36 AM PDT

I have a spare power supply that was good same end result

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Don't give up yet. One more thing.
by R. Proffitt Forum moderator / September 20, 2006 2:41 AM PDT

Since you didn't do the PSU test you gotta know about a problem I've run into.

Rear motherboard shorts. Sometimes I find an extra mounting post that shorts out the motherboard. Since you didn't do the power supply test we can't rule if it's the motherboard quite yet. It could be a "case short."

To sniff this out I put the motherboard with no CPU or other parts on it on a square of cardboard. Then the power supply and attempt the power up.

If that doesn't power up then I'm looking at the 2 possible bad parts.

Hint: I'd test the PSU as noted in my link with a volt meter and fan as I offered before.

Bob

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Pin 14
by grwilson / September 20, 2006 3:06 AM PDT

Tied the trick with pin 14 and ground got all the advertised voltages,I cleared the MB from any short
possibilities with a sheet of plastic still same result.

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Then your may have found the bad part.
by R. Proffitt Forum moderator / September 20, 2006 3:19 AM PDT
In reply to: Pin 14

Do other motherboards work ok?

Are there any bulging capacitors or jumpers you can remove?

Bob

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Motherboard
by grwilson / September 20, 2006 3:27 AM PDT

I know that on an old Motherboard that died I found blown capacitors it also took out a modem and my hard drive,on this Motherboard I don't see any signs of problem with the caps and there isn't any jumpers that would cause a problem but since every thing else has been checked I guess it's the MB.

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Since we are down to the motherboard. Are there...
by R. Proffitt Forum moderator / September 20, 2006 3:50 AM PDT
In reply to: Motherboard

ANY items that can be removed? Any battery, jumpers. We don't really care at this point but just are looking for the last possilble item just in case.

Bob

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just ps and mb
by grwilson / September 20, 2006 6:59 AM PDT

It's just the motherboard and power supply now still the same,this started with the computer going black every once in a while to not starting at all at first I thought it was the main power switch shorting out or something like that.I have an older MB with an outdated bios that won't run the larger hard drives
but I'll have to try it to see if I can at least get a power up,as for the bios I have always had a fear of flash upgrading the bios.

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Sorry. About that plastic.
by R. Proffitt Forum moderator / September 20, 2006 3:21 AM PDT
In reply to: Pin 14

The reason I use cardboard is that many plastics can have a surface charge of many kilovolts which can zap electronic circuits. There is that pink and black antistatic plastic but in the future try cardboard.

Bob

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anti static
by grwilson / September 20, 2006 3:30 AM PDT

I used the anti static type

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FIXED!!!!!
by grwilson / September 24, 2006 8:51 AM PDT

Found the power connector to the primary HD inadvertently still connected took it off and the power stayed on.I took the controller card off the HD and found a burnt chip!Thanks to you Robert Proffitt for all your help!!!

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Good to read.
by R. Proffitt Forum moderator / September 24, 2006 9:06 AM PDT
In reply to: FIXED!!!!!

This is partially why I instruct to put the motherboard on cardboard. I really know if we removed all the parts we can.

Bob

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Not Fixed!!!!
by grwilson / September 24, 2006 2:07 PM PDT
In reply to: Good to read.

Well I thought I had it fixed ran great for 5 hours then all of a sudden every thing went off again except for the green power light on the motherboard.I have it all together on cardboard now,I'm just afraid I'll blow another hard drive controller again I will run it again tomorrow hopefully I'll get enough time to write a dvd up of all the things that need saved!
I can't believe it it was running perfectly,I started with nothing except the motherboard and finally got it restarted,then added the CPU,memory,cards and finally hard drives and kept it running again,like I'm ready to give up!! ps:all on cardboard now

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The PSU is suspect.
by R. Proffitt Forum moderator / September 24, 2006 10:16 PM PDT
In reply to: Not Fixed!!!!

It can be damaged by such shorts. I'd set that one aside and use another for now.

Bob

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