When i start my pc it always demand for F1 and shows CMOS setting is wrong or time and date is wrong

The F1 key is often a notice that something is not right in the part of the computer that runs before the operating system (i.e. Windows). What is wrong is usually displayed in the rest of the message. It might be that your "floppy" drive is not working (you may not even have one), or that the "date and time" are not set, or that the chip that sets up your system before Windows starts has been reset to incorrect settings for your configuration.

On most systems there is a key you need to push, usually the DEL key, as the system first starts. (It may also be the F10, F2 or F1) Push that key several times...about 1 time a second...as you start the system. This should take you to the BIOS screen (BIOS being the name of the chip that runs everything before Windows takes over). In there you can look at the date and time...if they are not current, or close to current, your BIOS chip has a problem. If they are current, if you restart and carefully read the message that came up with the F1 key you will know where to look in the BIOS to fix the setting.

If the date and time are not correct you need to have the CMOS battery replaced. This is not the main laptop battery, but the little watch battery used to keep the date and time (and other settings needed) when you have shut the system off and/or disconnected the larger laptop battery.

If it's this problem...the time and date wrong...you will probably want to take it into a shop and have them change the battery. The little CMOS battery is only a few dollars (under $10) and the labor should be reasonable if that's all that is needed.

Hi names Rui,

For your problem the computer may display a prompt to press F1/F2 or any other key to enter setup each time the computer boots as a reminder on how to enter CMOS. However, if the computer asks to press F1/F2 (or another key) to enter setup and does not continue, this may be caused by any of the below reasons.

1. New hardware has been recently installed.
2. Error or confliction with settings in CMOS.
3. CMOS battery is bad or failing.

Solution:

New hardware has been recently installed

If new hardware has been recently installed into the computer, it is likely that you are receiving the prompt "Press F1 or F2 to enter setup" because CMOS needs to verify that the new detected hardware is properly being setup in CMOS. Enter CMOS setup and save the settings and exit. If you continue to get errors continue to the next step.

Error or confliction with settings in CMOS

If no new hardware has been added or you continue to get this prompt verify no error or conflictions exist in CMOS. Press the key to enter setup and verify that all settings are correct.

If your time and date are not set correctly, your battery is more than likely bad. Try setting the correct time and date, save the settings and then reboot. If after turning off the computer the time and date get reset again replace the battery.

If the time and date are correct and everything else appears to be correct try resetting the CMOS values to the defaults.

CMOS battery is bad or failing

If you continue to receive the prompt to enter setup each time the computer boots up and you have attempted to follow the above suggestions, your CMOS battery is bad. We recommended that the CMOS battery be replaced.

hope this will help you.

hi,
first of all check the main battery back of ur machine by unplugging from the mains power supply. if machine shuts off, then u have to replace the battery.and then set the date time etc by pressing F1. and then save it and exit set up. next it will not ask for F1 or F2.

if the main back up battery is ok, then another possibility is the CMOS backup battery of ur machine have some problem. that's why it loosed all the seted parameters. then u have to replace the CMOS battery of ur machine. normally 3V battery. then set the date time etc by pressing F1. and then save it and exit set up. next it will not ask for F1 or F2.
ok

[CHANGE YOUR CMOS BATTER WHICH IS INSIDE YOUR CPU CASE]
I do not think you fixed the CMOS battery - (backup battery = CMOS battery)
According to the error codes, you have a dead backup battery and the time is not set. Makes sense?
161
(Dead battery.) 1. Go to Checking the Backup Battery
2. Backup battery.
3. System board.
163
(Time and date were not set.) 1. Set time and date.
2. System board.


Go to www.ibm.com Find and download the user manual, and the "hardware maintenance manual."
Do you know how to get into bios/setup?

Start with the machine OFF. HOLD DOWN and CONTINUE TO HOLD THE "F1" key.
WHILE STILL HOLDING "F1", turn the power on, and CONTINUE TO HOLD "F1"
This will get you into the bios "setup." You should check the date, bootup order, etc, and reset.
I would check the "wire" you think you reconnected---you may just not have actually reconnected it.
The "hardware maintenance manual" shows you how to maintain this machine, and it explains the meaning of the error codes.

This will get you started on looking for the manual:

http://www-307.ibm.com/pc/support/site.wss/multiplefiledownload.do?validate=true

The only battery in a desktop PC is the CMOS battery. This is a 10c sized silver disc that is held in a plastic black clip on the Motherboard. It can be clipped out and easily replaced. they are 3.6v and somewhere like Radio Shack etc. will have them.

you need to go to cmos or bios setup, set all the date and time and proper boot setting there save and exit, it is a cmos or bios failure that causes these problems try replacing the cmos battery if the message still continues

Hello

Please reset cmos to factory defaults.
Then enter the bios setup and configure it and save changes.

plz update your bios

just press del to enter to the cmos and then change the date and time of cmos and press F10 to save your configeration if you start the cpu again and if you see the message "press F1 to continue and del to enter bios it time to replace your cmos battery inside of cpu is like a coin inside of your computer

Hello!


That's the 2nd time i hear that kind of problem. Your mboard battery is new, and you did not press "f1" at first start.

so i guess , the cmos time is not change, try go to the bios setup and load "bios setup default." after that change the time setting on the bios. please find time setting and set it with a current ime in your area. after setting press 'F10" to save and exit the setting, the system will restart.

may this help!

best regards, melnavz