I have a Toshiba Satellite A200 trip on power

through the add remove programmer or open the touch pad and checked it

The power adapter needs to be checked or better still sub out with a second power supply.

Try this link Toshiba Satellite A200 Service Manual download
Use the manual to disassemble the toshiba laptop.
Regards,Emillian

Hi,
for removing the password,

you have to open the memory cover and remove the two RAM s,
after that remove a black or whit plastic film depending on your model, you will loacte for B500 marqued ( XXX ) or J1 you have at least short
the two point with a flat screwdriver and put the upper memory and power on the laptop will holding the screew driver till you see the toshiba screen, if it doen't work just try again. it works 100%

Try removing / swapping / reseating the memory.

Try booting with one stick only, if the top slot doesn't work, try booting the bottom slot. Try both sticks.

Let me know what happens.

The problem is probably not in the motherboard itself, but may be internal to the laptop.
From what you've described the problem is either in the AC Adapter itself or in the power supply inside the laptop (the area where you plug the AC adapter into the computer.
The first thing to try is another AC adapter if you can get a hold of one or purchase one if need be as it's the most likely source of the problem. More than likely it's providing enough power for the system to recognize it's attached and draw power from it, but there is likely a short inside it or the cords keep the power from being constant.
If you do not have a full adapter to test with, you can replace the end that plugs into the wall with and universal plug - something you can buy at major retail stores. The adapters take a lot of wear and tear and can be damaged from all the stuff we put them through.

Remove battery and power

Remove memory in lower socket, the one on the system board and try reboot with just power cord. May have bad socket

http://battery-adapter.com/advanced_search_result.php?keywords=satellite+A200+keyboard

http://www.insidemylaptop.com/remove-replace-keyboard-toshiba-portege-a200/

If you know the current password, use it to enter BIOS SETUP.
Then, type a "blank" ("space-bar") as the "new" password.

If you don't know the current password, you're stuck;
this is a "security" feature to prevent a stolen laptop from being used by the thief.

The problem is not with the power supply or the power adapter. The problem is the hard drive of the computer itself. The hard drive could be corrupted and needs a reformat.

You have to reformat your hard drive as soon as possible so that you could still save it. The common cause of of corruption is virus.