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The motherboard battery is just a little round battery that you can buy at almost any retailer in most pcs. The model number to the battery is usually a CR 2032. This battery does not receive any power from your power supply. Have you noticed your PC loosing time over the last few months? This is usually a good indication that the motherboard battery is dying. The lights that you refer to though should only partain to the rechargable battery of the notebook. During the past two weeks while the red light was on, was the AC adaptor plugged in to the laptop and plugged into an AC source? If your AC adaptor has been plugged in and is not charging the notebook battery then there could be one or both of the following problems: your notebook battery could be bad or your AC adaptor could be bad. Something you may or may not know is that it is not good to keep the AC adaptor plugged in all the time. This causes the notebook battery not to fully discharge after being charged. Over a long period of time, the battery will not even charge anymore. My suggestion is that if you know someone with a similar AC adaptor to yours, borrow it to see if it charges your battery. If the battery doesn't charge then you know to replace. However, I am almost certain that you problem is the battery. Sometime older laptops like the one I have has a reset button on the underside. If yours has one try removing the battery and leave it out. Then plug in the power and press and hold the reset button for 10 to 20 seconds. If no reset button is on yours then do the same process with the battery removed and power adding, but hold the power button instead.
very first thing u have do is if u have any other laptop try and connect the aac adaptor with that laptop and also try the battery if it is working with the other laptop that means the motherboard of the computer has gone bad u need to replace it and what also u can try is disconnect the ac adaptor and take out the battery from the laptop and the without ac adaptor and the battery press and hold down the power button for one minute and then connect the ac adaptor and put the battery back in and then try and turn on the computer and also what u can do is shut down the computer first and then just hit the power butoon once only to turn it on and then keep tapping f8 key on the keyboard and it will take u to windows advance options and select safe mode with networking and then try if it turns on to the windows screen or not......and if it doesnt turn ono then definately replace the motherboard...good luck....
switch off - disconnect ac adaptor - wait 3 seconds - connect ac adaptor - repeat about 20 times.
Is charge light blinking when you connect ac adaptor?
Try reseating battery.
If battery is old (over 2 years) or heavily used then it may need replacing. They only last for 250-500 complete discharges.
You looked at the wrong part: the AC line cord to the AC adapter is rectangular. try this link for the correct part: http://partsurfer.hp.com/cgi-bin/spi/main?sel_flg=partlist&model=GE846AV+C700+SPARTAN&HP_model=&modname=Compaq+Presario+C700+Base+Notebook+PC&template=main&plist_sval=AC+Adapter&plist_styp=subcat&dealer_id=&callingsite=&strsrch=&keysel=AC+Adapter&catsel=%3F
Disconnect the AC Adaptor, Take the battery out, press and hold the power button for 7 seconds. Put the battery back in. Connect AC adaptor. Turn the computer on. If issue persist, restart and get into Advanced Boot Option by clicking on F8 Key and choose "Last Known Good Configuration" option. If issue persists please post for further help.
Take the battery out disconnect the AC adaptor Press and hold the power button about 7 seconds. Put the battery in and connect to AC adaptor press and release the power button. If it caused by static-component lockup, issue will be resolved. If still there is no activity including no power light check the AC Adaptor if its working
Below is the URL for compaq's Service Manual for that model. This shows you the details of every single part & how to disassemble and reassemble every screw. Surely it has to be in this document, somewhere. -->