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Re: cllock does'nt time when shut down ?
On your motherboard there is a small battery called a CMOS battery. It looks like a small watch battery. This battery is what keeps a small amount of electricity on the motherboard when your computer is shut off so it can keep the right time and date. So the CMOS battery is losing power, consequently your time is off. So need to get the battery changed and it will be back to normal.
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First - re-seat the hard disk and reboot the computer. If the computer does not boot up then reboot and go into the BIOS configuration to see if the BIOS detects the hard drive. If it doesn't detect the hard drive then it could be faulty. Then the hard drive needs to be replaced in the computer/laptop, Windows installed and the computer or laptop's device drivers plus your programs etc. to get a functioning computer/laptop again.
The RTC (Real Time Clock) battery charges when the computer in on (operating). You can plug the electrical cord in and let the computer run for 24 hours by temporarily suspending any sleep mode or automatic power saving features. This should sufficiently charge the RTC battery.