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ATX Power supply problem

By gwashburn ·
I have two ATX cases and two micro-ATX motherboards. I just bought the second case to hold my newer board and because I was having trouble turning off the old case and motherboard combination. I finally pulled the power cord on the old combo a couple of weeks ago because I could not turn it off and if the power went off it would not reboot until I could get the power supply not to be running as soon as power was applied.

I have now put the board in a new case and I have the same problem. The power supply in this case has a switch on it and when I turn this switch on everything powers up. Unfortunately the system will not boot when powered up like this. I have tried to hold the power switch for 4 seconds and other things but to no avail. Disconnecting the cable from the switch to the mb will not prevent everything from being powered up when the switch on the power supply is turned on. I have tried clearing the CMOS and just about everything I can think of.

Do I have a bad power supply in my original case and has that power supply ruined by MB? I have never been a fan of the soft switch ATX system and if the fact that some little problem with the power supply can ruin my MB will not imporve my opinion. Whatever happened to requiring a power good response from the CPU before the power was allowed to get to the rest of the system? I really have problems with the ATX soft switches on my servers. If I am at home and power goes off long enough for my UPS software to shut down servers, when the power comes back on I have to go back to work and turn on 12 of 15 servers. The other three have the positive off/on switches of the past.

Anyway any help on my problem of turning off the power in my new case will be appreciated.

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ATX Power supply problem

by Paul N In reply to ATX Power supply problem

You may need to enable some options in your CMOS.

First, make sure that the ACPI is enabled. This allows your computer to shut down by itself. You can check to see if it is enabled by going to the "Device Manager" and expanding "Computer." It should say ACPI.

Second, look for an option that says "Power Fail" or something similar. Set this to on, off, or previous state (whichever you need to set it to). This can save you the trouble of having to turn on your computers after a power failure.

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ATX Power supply problem

by gwashburn In reply to ATX Power supply problem

Maybe I did not make it clear enough. The system will not even count memory, flash lights on keyboard, activate the monitor, or anything that resembles actually operating. It merely sits there with the power supply fan running and the CPU fan running. The harddrive light comes on, but the drive itself does not spin up. It does not matter how long you wait the system will remain in this state until I can get the power supply to turn off while the power switch on the power supply is still on. I have not been able to accomplish this lately and not at all since installing the MB in the new case. Until I can get the system to power down using the switch on the front of the case it is useless.

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ATX Power supply problem

by leviathan82 In reply to ATX Power supply problem

I have had a problem similar to yours recently. When the system does not POST, then there are several things that can be wrong.
Since the power supply and CPU fans are running, that suggests that the motherboard is receiving power, and that the power supply is in good condition.
What you need to check is the connections in the motherboard. All of the PCI, ISA, AGP cards, as well as the CPU to make sure that each are fully seated and have not come loose. Then check all the connections into the motherboard from your floppy drive to your cd-rom drive to your hard drive to your power supply.
If every one of these things is ok, and you have reseated all the cards, then you need to look further to find an explaination. After you checkall of those things, there are probably 2 possibilites: Either Motherboard Failure, or CPU Failure.
There is also the possibility of your RAM going bad, as well as your video card. You should try to test each of these items individually to find which one is causing problems.
I doubt that the power supply itself caused problems with the motherboard. Most likely its a card that needs to be reseated, check those and then try testing every other component until you find the problem.

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ATX Power supply problem

by gwashburn In reply to ATX Power supply problem

The question was auto-closed by TechRepublic

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ATX Power supply problem

by NBI Computers Services In reply to ATX Power supply problem

I assume that you are not hearing any beep codes from your mother board. If the memory is bad or missing you would hear a beep code. You should also hear a beep code if the video card is bad or missing. Try this, Take the main board out of the case and place it on a non conductive pad. Like the one it came on. plug in the memory and video card. Also connect the twenty pin power plug a keyboard and the power button plug(the two pin plug that is connected to the case button). connect the monitor to the video card and lastly plug in the ac cord to the power supply and connect it to the outlet. make sure the switch on the power supply is in the on position and press the case button. If the fans power up and you see the memory count the problem is the main board has shorted out to ground in the case. This will not damage the main board but will cause the problem you stated. re mount the main board in the case using washers to insulate the main board from the case and slip a piece of paper inbetween the main board and the back of the case to prevent contact. I have seen this problem more times than i can count. If this helps please email me and let me know.

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ATX Power supply problem

by gwashburn In reply to ATX Power supply problem

The question was auto-closed by TechRepublic

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ATX Power supply problem

by gwashburn In reply to ATX Power supply problem

This question was auto closed due to inactivity

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