|"I done BOIS update, didn't help."|
I forgot to mention...........
You MUST load bios defaults, or clear the cmos, after flashing the bios if the version you used is different from what the mboarsd had on it before.
After you flash the bios, the first time you boot after that you will get a "Cmos Checksum Error...." or similar message. You will either be prompted to enter the bios Setup or you will automatically go there. Enter the bios Setup, and load Bios Defaults - save settings, reboot. You MUST do this (or Clear the CMOS by moving a jumper on the mboard) in order to make sure the bios update is fully accepted by the mboard's bios - otherwise, the contents of the Cmos part of the bios and what you see in the bios Setup may not match the bios version, and your settings in the bios Setup may not work properly.
If there is the choice to load Optimal defaults, use that - the bios should automatically use suitable settings for your situation.
Loading Defaults may work in situations where Clear Cmos does not help.
"Basically If the Primary Graphics Controller set to Onboard Graphics, my computer won't power down automatically :("
See the part in response 4 above starting
""But when i set Intel integrated graphics as Primary, my computer won't power down when i shutdown from any operating systems."
If you mean in the bios setup,.... "
Onboard = video built into the mboard chipset or built into the mboard, not video on a card in a slot.
"I have already installed all available drivers for my computer in Windows Vista."
See the part in response 4 starting
"Whenever you load Windows from a regular Windows CD...."
If you got the drivers from the mboard manufacturer's web site for your model, the main chipset drivers are often NOT listed!
The main chipset drivers for an Intel chipset are called the INF Update Utility.
Some chipsets also require you load the IAA as well after loading the INF update utilty, to properly support the enhanced drive controller features (if the IAA is listed on the Intel web site for XP for your chipset, you need to download it and install it as well).
"My computer is not powering down in ANY OS,
As linux doesn't need driver installation."
All operating systems have SOME built in support for detecting mboard chipsets properly, and it MAY detect all that is required properly, but you load the specific drivers for the mboard anyway, because the operating system can't possibly support recognizing all possible chipsets properly, especially if the chipset came out after that version of the operating system was released (in the case of XP I have seen no indication that support has changed at all in any version since XP was first released).
If you already have the correct drivers and/or information about the chipset installed, most main chipset driver installs will tell you it is not necessary to install them.
Main chipset "drivers" may have no actual drivers - for Windows operating systems they always have *.inf (information) files that tell the operating system what features it already supports the mboard has.
Check out the Intel web site to see if they have an INF update utility or similar, or instructions for where to get drivers, for Linux for the 945 chipset!
"My computer was powering down properly initially when i set WOL to Off."
That's "Wake on Lan" - wake up the computer when something accesses a networking chipset onboard or on the card. Your computer won't wake up when that is enabled unless you are to something such as a corporate or institutional network
That setting has no bearing on whether the operating system shuts down the mboard properly.
"When i put my computer in S3 Standby mode in Vista, my computer is successfully entering the S3 Standby mode and everything is fine until i try to wake the computer up,"
Most of the time Standby will work fine with the default bios Setup settings, if your operating system has the proper ACPI support information - if you changed settings in the bios and are not sure which you changed, try loading bios defaults in Setup.
If that doesn't help, you can probably find which Standby mode your mboard and it's main chipset supports in the manual for the mboard, and/or in specs for the mboard on the manufacturer's web site.
"But now the computer is not responding to Keyboard commands ..."
If the keyboard is USB connected, there is a setting in the bios that probably must be enabled - at least it certainly must be enabled in order to get into the bios Setup.
That setting is Legacy USB, or USB keyboard, or simlilar. In older bioses that is often off by default - in newer ones that is often on by default.
If you can't get into the bios Setup with a USB keyboard, that setting is disabled - if the bios is newer, loading defaults by moving the clear cmos jumper, waiting, and moving it back may get that to work, or in any case, connecting a PS/2 connected keyboard will enable you to get into the Setup.
A side hote - using an adapter to convert a connector on the end of the keyboard's cord for use in another type of port will NOT work unless the keyboard is a "combo" one designed and wired up so that it can be used with both types of ports.
Also, ACPI support, or if you don't see that, APM or power managment support of some type must be enabled in Setup. Bios defaults usually enable that.