Same Problem here. Toshiba L45 - s7423 won't power on. Power supply has almost 20 volts, Power light come on when I plug in power supply but Lap Top won't boot up. Tried with and with out Battery, still won't power on. Power Button seems to push in and out but not sure how to check it... ???

yes.you can but install Linux on a different partition of the hard disc

Press and hold the 0 (zero) key on your keyboard while powering on the computer. When the computer powers on, the Toshiba Recovery Wizard screen displays.

you need to dismantle it, take it to a repair shop unless you're familiar with the process.

Your can try to unplug and re-plug your screen connector. Turn over your laptop and look for a very small cap in the left corner. Take out that 1 little screw and look for the connector.
Hope this will solve your problem

Based on my experience this sounds more like a display issue, not necessarily the LCD but most like the inverter somehow cam unseated or it's on it's way out, then again it could be a graphic card that has come unseated without opening up the LCD bezel or examining the graphics card it's hard to say, sorry

Hope this helps.

Try cleaning the RAM.

Can you tell me whether this is a bios power on password, a hard drive lock password, or a windows administrative operating system password? I'm assuming that it is asking for a password when you say "locked".

I HAVE PROBLEM WITH MY LAPTOP WITH ALL DRIVERS PLZ HELP ME AND ALL DRIVERS SEND ON MY MAIL. THANKS

I am only going to say this once........vista is the best ........ believe me alot of people are afraid of vista ... I cannot understand why may I ask you SIR why are you changing from Vista to XP when they are both the same OS .......it is senceless ........exeriment man oh man experiment you will succomb.................

You want to downgrade the operating System.
Please visit this site.
Toshiba

Best Regards

Rafique