This is a very general question, and there are many possible causes. I'm thinking it's your power supply, motherboard or RAM. Complete failure of any of these can shut your computer down permanently. Unfortunately, the only thing on a notebook that will be worth your time is the RAM. Turn your laptop over and check for the RAM, it will be under a cover somewhere, it'll be on or two circuit boards with 6-8 little black, square chips on them. Take them out. If your computer will then boot to BIOS, this is most likely your problem. If it will not, it's time to either toss your laptop or check in with a computer technician.
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Black Screen with White bar is when Windows Vista loading. So it seems there is maybe problem with Windows. When your Toshiba is starting up - try press F12 to enter Bios, to check if everything is OK. If you have Vista on CD/DVD - you can try press "C" on keyboard when Toshiba start, to boot from CD/DVD and start to repair your OS, or reinstall it completely. Here - http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/globalEntitlement.jsp you can find repair centre for Toshiba near you, so they can help you.
Support Contact Numbers: http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/navShell.jsp?cf=su_contact&pf=true
Or use their forum http://laptopforums.toshiba.com/t5/System-Recovery-and-Recovery/bd-p/brd_recovery
u need to first change the boot seq in the BIOS...
press Del/F1/F2 key to get into BIOS after u press on the power button
change the boot seq to
1 CD ROM
now u need to safe this to BIOS
press f10 key to save the chnages in BIOS or use the save and exit option in BIOS menu to safe the changes
insert the WinCD(ensure it's a Windows install CD)
recovery or resuce CD of Win will NOT work.
if u need a goor Windows Install CD of XP,Vista, 2000
do a google search look for
"Torrent Piratebay WindowsXP SP3"
"Torrent Piratebay Windows Vista"
in the result list look for the above phrase of
download the Torrent link file(small 100kb file)
google and search BitTorrent
Download BitTorrent software and install it
use BitTorrent to open the 100kb torrent link file for the Windows OS that u got before
it will download an ISO file of say 400 to 700 mb depending upon which WinOS u download
burn that IOS image file to a CD using Nero or any ISO burner
use the CD to boot and install Windows
all the best
let me know if u were able to do it
We can only assume that because the cd drive operates then the motherboard is operating in part, although, the southbridge chip may be damaged, as the northbridge works memory etc.
Maybe it is that the processor is fried as there is no fan and the system then shuts down.
Toshiba are probably half way there with the answer, unless; they investigated further and decided it was not the processor but the motherboard.
It may be possible to startup in safe mode(press F8 on boot up) and highlight 'Last Known Good Configuration' or highlight 'Start Windows in Safe Mode.
If this gets you up try a system restore to before you updated driver or look for the system recovery folder, normally on another partition of your hard drive, that is if you didn't get a recovery cd.
If you are not able to get up and running you will need your Windows Installation Disc to either repair the system or do a complete re installation by putting in cd whilst you boot up.
It may also be that your HDD is damaged and thats why you can hear the cd drive powering up, looking for a system disc, as it cannot find Windows.