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This might be a dodgy stick of memory or memory slot. If you have more than 1 stick of memory, see what happens if you just use variations of just 1. Maybe try disonnecting all drives except the one you boot from. And, not sure exactly what you mean by works once and how far it gets after removing the CMOS battery. But does it get far enough to boot from a cd? If it does, try getting hold of a AVG rescue disk this will run a pre-boot virus check which may clear the problem if you're lucky. Obviously you would have to use a friend's machine to burn the disk. Unlikely, but could be a failing powers supply. Borrow one and try it instead. Otherwise, it really sounds like a terminal motherboard issue to me. Godd luck.
Could be lots of things. First check you power supply, then memory. See if any of the components are getting very hot (be careful not to burn yourself). From there it will be kinda hit and miss till you find what is wrong. May be easier to look for a compatible motherboard on ebay.
Possible main memory fault; swap memory modules if you have more than one installed. Otherwise, clear the CMOS contents in the Bios and re-configure. ( remove the coin battery and short circuit the battery socket contacts then re-install the battery )
Remove the battery and disconnect from power source.
Disconnect any USB or external devices.
Remove the hard drive and memory. Disconnect the CMOS battery in the memory compartment.
Flip unit over and hold power button for 30 seconds.
Re-install memory and hard drive.
re-connect your CMOS battery.
Power up unit without battery installed.
Boot into safe mode.
Go to a command prompt.( start, programs . Acc. , dos prompt or command prompt.)
and type chkdsk /f
You will get a message that says can't run know but would you like to run a next bootup ? Say yes.and and type exit.
Next, reboot unit.
Hope this works for you.
161 - Dead CMOS battery.
163 - Date and time are not set clock not updated.
Replace CMOS Batt: On the bottom of the laptop you will see a screw
that holds the memory cover on. (Next to the main Batt) Remove the
screw and cover. The CMOS is plugged into the motherboard it is yellow
and round tucked in the side of the case. (note how the black cable is
towards the center of the laptop and the positive red cable is towards
the side of the laptop). Remove the cable connector from the
motherboard and pull out the old battery. This can be done by either
gently pulling on the cables or using an object like a toothpick and
gently tugging at the old battery to free it. With the old battery
removed plug in the new battery with the black ground cable towards the
center of the laptop and the red towards the side of the laptop. Insert
the new battery into the space the previous one set at. Reconnect the
memory cover and turn on your laptop. You will have to set the time and
date and may have to cycle the computer (reboot) a few times. You can
get this battery (CMOS) on eBay or at a computer store they are only a
few dollars. (5-8) Good luck in your repair! you need a cr2025 to replace it you have to pull the tabs of the old one off and tape them to a new cr2025 battery. then 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.