Computer won't shut down.

you are cold booting the pc always shut down normally when you shut down just useing button it will eventually corrupt the system I have several computers and never shut them off at all unless installing new hardware if you get a keyboard with the specific button just for the sleep mode this problem will clear up but if you shut down normal it will work rite

if you're not on a RAID, go try and remove it's cmos battery. then boot it up. shut it down then return the cmos battery.

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your ((motherboard to your hard drive)) make sure they have a secure connection and are not faulty or just replace them there probably old and faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they are probably old and faulty a computer needs its connections to have an end so any faulty leads will end up with a computer error

hope this will help
don

It is probably over-heating.

If your using a MAC try the below steps as this worked for me:

1. User - Library - Prefrences - com.apple.iTunes.plist
2. Delete that com.apple.iTunes.plist
3. Restart the computer. It should recognise.

If your using a PC the steps are lengthy, and the steps are:

Restore I-Phone
1) Close all programs and restart computer.
2) Open iTunes and plug in powered off iPhone with direct USB connection.
3) If iTunes fails to connect to iPhone...continue to #4, if it does...restore.
4) Shut DOWN iTunes again.
5) Power OFF the iPhone & Disconnect from computer. (Power off two ways-one will work, hold home and sleep button until off or just hold sleep button until off)
6) Hold down Home button & connect to computer using direct connected USB cable (keep holding down the home button until iTunes sees it).
7) It should go into recovery mode and iTunes should recognise it.
8) If you want to recover to previous software version, Hold Alt/Shift and click restore in iTunes. Then select the old update version.

If the above steps doesnot work then try the below steps:

1. Turn the iPhone ON
2. CONNECT it to the computer with a DIRECT USB connection.
3. Make sure iTunes is open so you'll know when it enters DFU mode.
4. HOLD the Power/Sleep-Wake button AND the Home button for 10 seconds.
5. RELEASE only the Power/Sleep-Wake button and continue to hold the Home button.
6. WAIT until iTunes recognizes the phone in DFU Restore mode (in Windows a bubble pops up saying it recognized new hardware "DFU Mode" or something to that effect)
The last step may take SOME TIME, like, say, even 60 seconds or so.
The screen should be OFF (black), if you see the "Connect to iTunes" logo, START OVER.
It may take a few tries to do the steps just right, just reboot
(hold both Power/Sleep-Wake AND Home until the Apple logo appears and the phone turns back on) then try again.
7. Then restore the iphone

-Plug one end of the cord into your phone and the other in your computer
-Remove the cord in your computer, leaving the cord in the phone still plugged in
-Hold both the home button and on/off button on the phone
-Once the screen turns off, let go of the on/off button but continue holding the home button
-Plug in the other end of the cord in your computer while still holding the home button on the phone
-Once the apple logo appears, continue holding until you see the plug into itunes screen on your phone
-Click restore.

Hope this should resolve your issue :)

old post 2017, 1 year old. Desktop and very old monitor.
This old monitor is CCFL and those fail super easy now.
built in 2005, backlamps are mostly dead now.
VGA cable? or DVI#1 or 2 port connected
the monotor told you PC went to sleep mode
I believe it. I bet the monitor works on any other PC you try, I bet.
so put the PC VISTA in into presentation mode.
(like we do with presentations, or kiosk mode, or using a nice DLP projector in theater)
just one app does this below
or learn to use
control panel, + Power settings, and advanced.
turn off all sleep modes,all hibernate modes.
turn on all wake-on modes, for sure USB ports.
make sure device manager is not showing dead devices (chips) if it is , that means get the missing drivers from Dell, for VISTA. Dell has them on your support page
and we are not DELL.

https://downloads.tomsguide.com/Dont-Sleep,0301-28162.html

turning off all the power saving items does not help this- it just ensures that it doesn't automatically power down your hard drive or shut off power to your monitor automatically when you aren't using it.
May I suggest Hibernation Mode as an alternative? this mode saves everything you are doing to disc and shuts your computer down completely. when you turn it back on, it will restore what you were last doing onto the screen, so you can pick up where you left off.
you can find more information on this and sleep mode from here: http://windowshelp.microsoft.com/Windows/en-US/Help/335c6a5d-0304-4af1-b135-6bf6c124dc111033.mspx#EZAAC

Cheers,
-Demolitio

It depends on how long computer is being used in a day.
for general use
you can shutdown your computer once in 2 days but i highly recommend not to put in sleep mode and betting putting in hibernate mode instead of sleep mode.
note: most of simple issues are resolved by restarting PC so you can guess now how important is to shut down computer.

Good luck,

try reinstall whole system but don`t forgot do back up first ;)

Yeah, im not sure about how to fix the problem with it shutting down like that, but one option is to go under your control panel and taking off the sleep function, or putting it on a 4 hour timer so that doesnt go into sleep mode anymore. However, the problem is not your monitor but your computer. Id just take the sleep mode off, there is no need to have it on.