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Old 07-18-2011, 12:32 PM
 
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Sometimes a computer will crash/freeze so badly, that the power button will no longer work normally. You will have to hold the power button or even unplug the power cord. Then it goes back to normal.

Why does this happen? Why would a crash stop the power button from working? I thought the power button would be independent from the computer's memory.
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Old 07-18-2011, 12:34 PM
 
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Quote:
Originally Posted by robertpasa View Post
Sometimes a computer will crash/freeze so badly, that the power button will no longer work normally. You will have to hold the power button or even unplug the power cord. Then it goes back to normal.

Why does this happen? Why would a crash stop the power button from working? I thought the power button would be independent from the computer's memory.
Because it is a button, not an on/off switch.
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Old 07-18-2011, 12:51 PM
 
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Quote:
Originally Posted by Asheville Native View Post
Because it is a button, not an on/off switch.
But why does the crashing program stop it from working?
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Old 07-18-2011, 12:58 PM
 
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The crashing program has nothing to do with it. If you press that button when the PC is running correctly it still has to be held in to shut down the PC. It's a safety thing. Used to be you could shut off your PC by accidentally bumping that button. Not good.
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Old 07-18-2011, 05:33 PM
 
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A PC power button is a momentary switch, it only makes contact when you press it. The OS can be set to react to this press in different ways, shut down, sleep, hibernate, or do nothing. If the OS is locked up there is now way it can tell when the button is pressed because it's innoperative. When this happens holding the button in will trigger the motherboard to shut down altogether after 5 seconds or so.
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Old 07-22-2011, 08:52 AM
 
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Have you shown your computer t any computer repairing shop? If you want I can suggest you.
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Old 07-22-2011, 11:36 AM
 
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This is a feature in the BIOS, you can adjust the settings but the usual options are Powering off with a 4 sec hold on the switch, or having it go into suspend doing the same, though some BIOSs may have the option for an instant off function to the switch.

Look under Power Management in your BIOS if you wish to adjust how this functions.
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Old 07-22-2011, 04:55 PM
 
Location: Central Texas
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In most PCs, pressing the power switch merely sends a signal to the operating system that you want to shutdown. If the operating system is frozen, then the shutdown signal is never processed.

Holding the power button down causes the electronics to intervene and removes power from the system without letting the operating system do the shutdown.
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Old 07-22-2011, 04:58 PM
 
10,752 posts, read 17,999,763 times
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Quote:
Originally Posted by hoffdano View Post
In most PCs, pressing the power switch merely sends a signal to the operating system that you want to shutdown. If the operating system is frozen, then the shutdown signal is never processed.

Holding the power button down causes the electronics to intervene and removes power from the system without letting the operating system do the shutdown.
I think I said that already
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Old 07-22-2011, 07:20 PM
 
Location: 10110001010110100
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Power switch interacts with motherboard not the OS, mobo interacts with the OS based on the signal(s) it receives.

If the switch is not working/responding as it used to then either the switch is going bad, wiring could be loose/shorting or the mobo is faulty.

My concerned would be with how often the system is crashing/freezing and for how long has it been occurring.

How old is your hard drive and the operating system image? If you encounter Blue Screen of Death then the image might be corrupt or getting corrupt. Also the overall performance of the system/applications could clue you in on this too.
Cause could be anything from a malicious infection to disinfection collateral damage to filesystem to hard drive forming bad sectors and going bad.

Two other overlooked components are:
Motherboard - shorting or have bad capacitor(s)
Power Supply - New or old, cheap, low end PSUs are always a good suspect. It could time to replace it either due to its age or not being adequate enough to handle power needs of the system. Many people upgrade their CPU, add more RAM/HDs and new power hungry Video cards without thinking the PSU might be handle the load. Inexpensive PCs, even good brand name ones typically come with Power Supplies that can only handle a slight more then the PC's default configuration so significant hardware upgrades could easily create a problem on the power side.
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