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Boot up Shut down then Boots up

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by shantie 1 view

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This one has given me a headache!!!
Asus A7v8x mxSe M/board & AMD athlon 2600. Initial problem system would try to boot, shut down and would boot after a few tries.
At first I thought it might be the on switch on the case. I disconnected everything except the hard drive, it did the same thing. So I tried another hard drive worked okay, the annoying thing is it let me install WinXP, then I shut down, next boot it did the same thing. I then tried all the following
Diff PSU, cpu fan, cpu, ram, then a diff video card. Still the same. So I decided Motherboard. Set up new motherboard and would you believe did the same thing tried to boot and shut down. So I was left with only the case as tried everything else. So shifted everything into a new case and it all works. Only problem that worries me is at first boot still tries to boot, post not yet on screen, quickly stops, then quickly boots back up to windows. The owner says never done this when new but started a few months ago. To satisfy my curiosity about the On switch on the original case I installed a new motherboard and Cpu, does the same thing, power cpu fan starts then stops. Both these systems have Amd athlon cpu's I do not usually use these, is this normal for these cpu's?? Why are both computers doing the same thing, but new case actually does boot. I have just noticed swithching the new case on that it has not done it this time. Last thing I changed was the cmos battery as I thought it might be loosing boot up info, when I installed the new battery, I had to reset the data in the Bios, is that normal, I have not had to do that before or could there have been something wrong with the cmos settings and battery?? I would say there is definately something wrong with the old case On switch but cannot figure out the problem with the new case.
A bit confusing but any ideas. Thank you

9 replies

by willcomp

Shantie,

Hope I was able to follow what has happened.

First, AMD CPUs behave just like Intel CPUs. So that's not the problem (unless CPU is faulty).

You replaced mobo in original case and still had same problem. Moved original mobo to new case and it is working OK.

For original case:

1) Disconnect power switch and use jumper to power on and off. This will either verify or eliminate switch as part of problem.

2) Nowhere did I see a mention of changing out power supply which is the most likely culprit.

3) Another possibility is mobo shorting to case, but that usually occurs on new builds.

4) One last possibility is a stuck reset switch.

And, yes, BIOS will reset to default configuration when battery is removed. As a matter of fact, I've pulled many a battery to reset BIOS when there is no reset jumper on mobo.

Dalton

by willcomp

If reset switch is stuck, won't be intermittent and system will never boot (will just power on, reboot, and reboot, and reboot,........).

by shantie

Thanks for the answer, I think some of it could be right. Problem was the motherboard, although there was still a fault with the case switch, wondering if due to switch not working properly and system shuting down then quickly booting back up if it damaged the motherboard. I finished up using two different cases, ONE- with her motherboard and a new cpu, and TWO-another case with a new motherboard and her cpu. The second one worked but the first one still kept rebooting, so was fault with her motherboard and could have been the reset switch. Replaced motherboard and all is fixed, thank you

by unidentified

Try putting a masking tape on the screw handler of your casing b4 screwing ur mobo. This will serve as a catalyst for the shortings

Have done this quite and it works

by shantie

Sorry but hard to figure out what you are suggesting, but it ended up being a fault with the motherboard. thanks for the reply

by _christian_

The previous 2 answer look right to me, but there is one more possibility, which I have seen myself about a year ago, on dodgy boxes from a batch of about 300:

On those frames, the front panel button does not actually directly press the switch, but there is an intermediate plastic piece.

On some frames the piece was missing altogether, and on some other, it was damaged or faulty.

The symtoms when that piece was faulty were very similar to yours.

by shantie

Your suggestion relates to the case but I have not got around to looking at that yet, other problem related to a faulty motherboard, which I replaced and also replaced the case. I can understand what you are saying about the switch as I have had a couple of bad ones but usually would not switch on at all. Had to take it apart and re-silicone it together. thanks for the answer

by shantie

Thanks for the replies, most answers relate to the old case and have not had a chance to look at that yet, as trying to get this system back to owner. Now the same m/board and cpu are in a new case with new power supply. Does boot up, but first quickly boots, does not get to post screen, then quickly shuts down and then reboots up to windows. I replaced the cmos battery, and thought I had fixed the problem as booted up okay a few times after that, but then did the same thing rebooted. I then updated the bios and for the last couple of days have started it a few times with no problems. Then this morning did the same thing, rebooted. I will try a brand new cpu and see what happens. Someone did mention the reset switch on the m/board, so if the new cpu does the same thing I will then have to try a new board. Why is this intermittent, okay for a couple of days then problem occurs again?? Any more ideas Thank you

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