If you haven't given up on your computer the solution maybe not the switch, but something loading the internal supply. The most common piece to fail is the cpu. The failure is usually from excessive heat with the cooling path clogged or not letting the air to get the opening on the bottom for the fan. Also as laptops get older the cpu's heatsink grease needs to be cleaned off and new heatsink grease put on and at the same time a thorough cleaning of the heatsink fins. If the cpu fried you may see some brown hazing on it surface.
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The most common way that most of us know on how to reset or clear the BIOS password is to physically remove the power from the computer by disconnecting the power plug and then removing the cmos battery for 30 minutes from the motherboard. Another way is to reset the clear CMOS jumper on the motherboard itself. Both of the 2 methods mentioned works because most motherboards use a battery to sustain the BIOS/CMOS settings for the motherboards PROM chip. So by cutting off cmos the battery power, the BIOS/CMOS settings will be erased.Hope this helps
Try removing the battery and using just the power supply first, if this works then it is a battery fault, is that doesnt work then try another power suppy or get your power supply tested, if not either of these, then it may be the PSU connector inside the laptop
You will need a 2.5" SATA HDD to change with. (the operation must be done with the laptop shut down) Unscrew the container with the HDD sign and remove it. Being SATA you just have to plug it in the connectors and it should work. (of course you'll have to format it and reinstall your OS).
You have an obvious electrical problem. It could be that the switch on the power module is faulty.
Remove the hinge cover and depress the power switch on the power module. If the system is starting without hinderance then the issue is the tab under the hinge cover is not making proper connection with the switch below. If the same problems persist when you go directly to the power module then the module has a faulty switch. Radio shack has those tact switches for $3.58. You can either replace the switch or replace the module.
try removing the battery, and unplugging from the wall. now press and hold in the power button for at least 30 sec., reinstall battery and ac adaptor and try to power on. if that doesn't resolve, you may need to have the RAM (memory) checked out, as system memory is usually shared for video
The problem is well known witht this model Toshiba - the problem is the fan stops working and then hence shuts down to prevent overheating - it does not take long once the laptop is hot. Without replacing the fan just reboot the laptop until you hear the fan start again on reboot.