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Sounds like your keyboard maybe bad or disconnected. Try connecting a USB keyboard to it. Give the computer a couple minutes to detect the keyboard and install its drivers, then try typing. Otherwise your operating system (Windows) may be frozen up. If you see a spate of hard drive activity (the blinking hard disk light) after plugging in the keyboard, that would be the computer detecting it and installing drivers. That's a good sign showing the computer is alive and not really frozen.
Resetting password & user name:
b>*Start your computer *Keep pressing "F8" as the computer starts. *This will enter the computer in Safe Mode. *(When the window "Advanced Boot Options" opens, choose "SafeMode" with arrow key and confirmby pressing the Enter key, then computer enters Safe Mode. *Once you are in the Safe mode Click "Administrator" on the Windowslogin screen. *Take note that you have set the Administrator password before, you need toinput the changed password instead of leaving "Password" field blank. *Then click Start > Control Panel > User Accounts > Select the accountthat is locked and change the password. **Restart computer and login into the account you just created using your newpassword.
Use Unlock Samsung Bios Recovery Service and for $20 they will send you the bios master password and they guarantee it to work. I have used in my work many times and I have always been happy with their work.
best bet is to replace the keyboard. They are cheap (under $20.00) and
easy to replace. All other options involve making a bootable flash
drive (more complicated and you still have a broken keyboard)
try : start-control panel -mouse and keyboard, if nothing weird appear,try to reinstall the driver for the keyboard,you'll find it here:http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/modelContent.jsp?ct=DL&os=&category=&moid=1311513&rpn=PSMA0U&modelFilter=M105-S3002&selCategory=3&selFamily=1073768663&selModel=1311513%7CPSMA0U
If it doesn't work you will have to change the keyboard and hopfully, there is nothing wrong with the motherboard