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If you mean that the time/date needs to be reset every time you power up your computer, then it's the CMOS battery on the motherboard which needs replacing.
This small circular battery keeps your PC settings )time/date) 'alive' when it the computer is powered off. A dead battery won't damage your computer in any way .. it just means that you have to reset the time and date every time you switch it on.
The battery is on the motherboard. It's just like a rather large, circular watch battery. To change it (with PC powered off) remove one side of the casing. Look on the motherboard and locate the battery. With a pin or small screwdriver prise out the battery from its housing underneath its retaining metal tag. Put a new battery in. It's as easy as that.
N'parlez vous Francais
I'm sorry my French is a little rusty,,,,are you asking about changing time and date on your desktop computer?
Put your mouse cursor on the time, then Right-click on it.
Change the time and date.
If the time and date changes back after you have reset it, then you have a bad CMOS battery. Replace it.
This is a type of watch battery. Generally it is a CR2032.
This flat coin looking CMOS battery is located on the motherboard.
Make sure the computer is off and unplugged from power.
FOLLOW anti-static precautions. (If you do not you will fry out the computer)https://www.youtube.com/watch?v=ao866I9XpTo
Remove the CMOS battery and replace.
If you come back in a Comment, and state the computer manufacturer name,and model number, I should be able to lead you step by step in replacing the CMOS battery.
first you will need to replace the cmos on the system board(or have a qualified computer service tech. do it). then you will need to access the bios settings by Pressing F1 immediately after powering on the computer. once in the bios, you can set the correct date and time. Also, you will need to check the drive settings to verify that the hard drive and any CD/DVD drives are recognized. once done, then exit the BIOS being sure to chose "save and exit", then allow your PC to boot normally. this should fix your date and drive issues. if not then the motherboard may be defective.
Depending on how long the power was off, your desktop power supply circuit capacitors may have fully discharged during the power outage. This will effect how fast your computer will turn on when you press the power button. Turning off the power by pulling the cord, or a power outage while the computer was on will usually result in a message that Windows was not shut down down properly when you try to restart it. Also make sure your computer isn't plugged into a 'switched' receptacle that's wired to turn on a table lamp etc from a wall switch. It's usually the bottom half of the receptacle that's switched while the top plug is always 'hot' or powered and unswitched in a wall switch controlled recepacle situatation.
Try changing the time and date in the BIOS and then save the changes and exit. Then turn the computer off.
Wait a few minutes then turn the computer back on and if the date resets back to 2001 then that means the battery on the motherboard is bad and would need to be replaced cause that means the BIOS isn't keeping information in memory.
The battery you would need is a cr2032 battery. Here is an enlarged image of the battery Im talking about:
I guess there is error saying wrong RTC Time Press F1 ... or something along those lines. You need to get replacement battery for your MB. This is a battery that provides power to the CMOS chip with all BIOS settings.
Yep most likely.
Do you know how to get into the BIOS?
If so, get into the BIOS setup and set the time and date in there. Then turn off, and unplug your computer and plug it back in, turn it on and check if the time in the bios has reset. If it has, ring up HP if it's still under warranty. If not, take it to your nearest computer service place and have them replace the battery.
Try this remve the batteries again and leave out overnight I mean fr hours on end your bis will reset sometimes it has to be 24hours I know it sounds unbelievable but after all it cost nothing but time. What hapens is the bios will reset then put your batteries back in and go into setup again in the bios......and reset to default settings be sure to change the time and the date manually then save by pressing f10 goodluck please come back and tell me how you do..