My Toshiba Satellite PRo L300 won't shut down.

Toshiba satellite L300 is connectting adapter on turn off machine how problem?

you cannot blame windows xp because according to me it is such OS that it removes many problems of windows 7 and vista.windows 7 and vista makes your pc much slow and many features dont work but windows xp is free from these errors.actually you hear the sound but nothing appears on the screen.this is because your cpu fan is running which takes somes time to stop.may be some problem of the hardware especially the mainboard.go to any repair shop and just get it checked.

right off the bat, i would suspect a bad power adapter for the computer. or perhaps a faulty computer. your best bet is to call toshiba and talk to them directly.

Your Hard drive is faulty which means it wont go any further and loops back trying to fix a problem it cant do. you can either replace the hard drive and install everything from scratch or send it in to a computer repair shop to do it for you. Kronoguy

If pressing down and holding the restart/start button doesn't wake it up you might try Control + ALT + DELETE keys (together) - that will reboot it though. And if that won't work then you might have to pull the battery to reset it.

It seems that some laptops have a problem with vista and sleep mode, in particular, and sometimes hibernate too. You can try going under POWER OPTIONS under Control Panel and setting everything back to default, saving it, then resetting it again. Also it's best to avoid using sleep mode if possible to avoid problems.

If the problem developed after a recent install or updating you may need to go to an older store point to fix the problem. Personally, I just avoid using these settings as much as possible and use regular shut down and a screen saver for times when I need to step away from laptop for short periods of time.

Replace the AC Adapter, (ebay from £10.00).
Did it come with XP on it? Mine came with Vista and there are conflicts with XP and graphic adapters. There is no XP driver for the ATI adapter in mine.
Go online to Toshiba and download all of the updated drivers that you require. A user friendly system.

it's mean your operating system is failure so just do repair or format Ur OS & re install fresh copy of operating system..but take backup ur document before formatting Your OS.

I have had a this few times... what happens is the Contacts on the Socket for the power supply comes away from the Motherboard. Subsequently, it will not charge, nor power on... & then the battery gets so flat that it stops it all from working... You will have to get it repaired, it is a bit of a mission. & sometimes the damage done to the Motherboard precludes repair. So get a firm "Quote" from a reputable service center/man.

When you power up, turn the notebook so you can see if the cooling fan is running.

It sounds like the self protect shut down from over heating.

Open the "Task Manager" by (right ) click in the Statusbar, located in the same (level as the start button). Next see how many Processes are running? If the (number) of processes running are between 75-80, the Computer is running very slow, this could be a ("Low") Memory problem, you can check the "memory usage" in the "Task Manager" as well. Try to "Shut-down Non-essential programs from "start-up."