why does HP PC shuts down internally but power light stays on
Posted 29 December 2008 - 02:50 PM
Any ideas would be appreciated
Posted 30 December 2008 - 06:26 AM
You say the computer is left operating when not in use;
First possibility is that the temperature control settings in CMOS configuration are terminating the cpu, co-processors and system BIOS funtions. Being a semi new computer (3 yrs old) The system's CMOS configuration may provide options that monitor the cpu's core temperature and will automatically terminate the cpu's operations when the temp reaches 58^o^ C.
In this state, the computer is not shut down (off), so the power light will remain on while the cpu core cools down. Typically the internal fans would remain on to aide in the cooling process, however, if the cooling fans are operated by direct connection to the power supply, and the power is terminated to the specific systems requiring cool down, it's possible the fans are also disabled. Pulling the plug is the only way to interupt this state.
CMOS temp control settings can be adjusted to prevent this from occurring, however cpu life expectancy will be severly effected. Try to put it in a cool place away from heat ducts and exhaust vents.
The second possibility is that the integrity of the power supply itself is failing to provide regulated supply to specifacations. Where as some components of the power supply are maintaining operation while other (higher wattage) output circuits fail. Being an intermitent effect makes it difficult to isolate, so if you have access to a compatible power supply you can substitute it with (without the expense of purchasing a replacement), you can test the effect over time to see if the problem is rectified. If after a couple weeks the problem doesn't recur then replace it with a new one.
In any event, I can advise you that every second your computer is operating idle, you rob it of it's lifetime expectency, ALWAYS shut down your system when your're not using it. Save yourself both aggrevation and costly repair or replacement by simply turning it off.
Good luck and keep me posted of any new developments.
Posted 30 December 2008 - 07:59 AM