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Re: M700 won't work on battery anymore
This could still be a bad battery, even though the indicators and the machine are telling you that it's charging. Laptop batteries are a bit more complicated than regular batteries, they have built in fail safes in order to keep from damaging the machine if the battery malfunctions. If a fail safe has engaged due to a malfunction this could cause the problem. Start by trying a new battery. If a new battery doesn't cure it, then the problem may lie with the power management system on the motherboard.
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You need to find out if the power supply was damaged, it would have been the first to take a hit, remove the main battery to see if it will boot because a bad one will load the system down in some cases. One trick that might work, unplug power supply from laptop and remove main battery, now press and hold power for 2 minutes to drain off residual voltage and reset the processor, finally install everything back and power up.
Borrow a cd from someone with the same version of windows as you have. For example xp pro or vista. Boot from the cd as go along as if you were going to reinstall. If XP select enter, esc, f8, then r. Those are the answers to the screen questions. In vista boot up the cd then select repair reinstall. It will remove windows files and leave everything else in contact then it will reinstall windows without harming programs or files. It kind of rebuilds itself.
Goto a radioshack and ask if they can give you a replacement AC adapter for the computer. Bring the computer with you so that they can match it up. If the computer charges and works with the new adapter, it was the plug/adapter that you were using. If it still does not turn on, it may be a problem with the socket for the power adapter and you will need to have a certified repair technician take a look at it
Had the same problem with My Compaq M700 No Boot Or Post. Battery Light Flashes 8 Times, Have to Wait 24 to 48 hrs sometimes longer to get Laptop to Start. Tryed the DC Converter Board Change No Difference same Problem. Noticed When Laptop Did Start Clock Time Was always a Little Off 2-4 Hours sometimes more. So Figure CMOS Problem With Time Issues. Read About Battery Memory Transitor Voltage spike Detection Issues Corrected With Newer Bios Flash at HP Supports. So I Flashed Bios With Latest 686h. During the First Boot After Reflash Battery LED Did flash No Start, After pushing the power button again it Started. And has Every since.So Far Laptop Now Boots Everytime and CMOS Checksum Seems To Keep Time Correct In Windows. The Bios Flash Corrects a Voltage Spike Detecting Transistor In The Charging Circuit. During First Start after flash Bios will run system test on the charging system and Correct CMOS. Worked for Me Hope this Helps a Few.