Not in Service

Try this, open Control Panel, Power Options, set to High Preformance, set Sleep and Hibernate to Never, use this procedure to adjust power options: http://msdn.microsoft.com/en-us/library/ms700612(v=vs.85).aspx ALSO, always shut down from the "Start" button, select "Shut down", if you use the on/off button the software "ID's" it as a crash, hence the startup error messages. Two more things, Open MSCONFIG select Normal Startup, use this procedure: http://www.netsquirrel.com/msconfig/msconfig_vista.html , Run a SCAN FILE from CMD prompt using this procedure: http://support.microsoft.com/kb/929833 Post results.

Hi

Please check your processor fan is working or not, if no then go the Hp service center for repair the FAN.

simply disable the automatic update service by following these steps.....
start | run | services.msc | automatic update
stop ...and disable it...click ok
and close the service manager....

then try to shutdown the machine ....

enter feature 984
the display should say log:
enter 1020000 and press ok
display should say <date>
press next if ok or chng if not
display should say enter hhmm:
enter time in 12 hour format
display should say retry am pm
press applicable key
press next then Rls

unfortunately is sounds like your system has been compromised by a virus; which has erased or corrupted needed system files. before you give up and reformat your system you should try the Spinrite program, written by gibson research co. you can DL it here .. http://btjunkie.org/torrent/SpinRite-6-0-Release-1/3779c30edea9218ee5596b3b8c62a0aecc56767e1047

you will need a torrent service like; utorrent, shareaza, etc

Try powering off the voicemail system and and then power it on again. I've had it happen many times that after a power failure they just don't boot up correctly.

It was a faulty or worn out power supply fan. I just replaced it and the computer has been running for about an hour and a half and still no shut down. The system temperature is stable. It runs quieter now. New fan cost 13.88CAD.

Most proably it is a main board problem. Contact authorized service center.

Ok based on just the monitor turning off Lets try this,,
FOR WINDOWS XP
1.) Right click on your desktop
2.) Choose properties
3.) Click on the screen saver tab
4.) Click power
5.) Set The POWER SCHEME to Home/Office Desk
6.) Set the Turn Off monitor to Never
7.) Set the Turn Off hard disk and system Stand By to never
8.) Click apply then ok
9.) Repeat steps 1 - 3
10.) Set the wait time to 30 minutes
11.) Click Ok
12. Shut down and restart your system and wait 30 minutes to see if the monitor will shut off if it doesnt then Your good to go
If it does Then disable the screen saver.. and wait half hour to see what happens

POST BACK HERE AND TELL ME YOUR RESULTS OF THE ABOVE SO WE CAN TRY SOMETHING ELSE

Locate Power Wakeup option in modem/LAN in BIOS and disable them, if you have "power wake up" enable for LAN/modem your computer will be switched on for remote network command.power wake up setting are located on BIOS.