Hello,
If your keyboard won't work, then it means you will have to do replace it. But before that, you will have to check first if the keyboard isn't disabled on your PC.
Go to Start > Control Panel > Keyboard.
Select hardware, select your keyboard name, then click properties. Click Change settings, click drivers and check if your keyboard was uninstalled or disabled. If it was disabled, you can enable it.
But if the above isn't the cause of the problem, get a USB keyboard (external keyboard), insert it into the USB port of your Toshiba protege m400 and it should work pending the time you have your keyboard replaced.
Good luck.
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