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Try installing the latest audio driver. You can download the audio and device drivers for your model laptop from the Toshiba WEB site from theirdownload page. Make sure you enter the model of your laptop so you can get thecorrect drivers. Please click on this link: - http://www.csd.toshiba.com/cgi-bin/tais/support/jsp/home.jsp
Sounds as if you may have a currupt file on your registry,to prevent you booting up to your desktop and the system is just hanging...
When the screen goes black can you see and move your mouse cursor,or does the system freeze..????..
My next suggestion would be to reformat,and a fresh install....as long as you know your screens o.k....
If you can hear the startup music, try plugging the laptop into a regular monitor and press FN+F5 to view your operating system. This will mean that your backlight has blown and you need to replace the screen. If not, oh boy, it could mean that your motherboard may have taken a dive. Before you trash it replace the meory chips, just in case they have become defective.
If you do not have a disassembly manual, here is one to go back and track your steps.....There may be other connectors you have not detached. Check carefully, screws aren't the only things holding the mobo in place. I think the M35 uses special nuts on the VGA port, these have to be removed for the motherboard to release....There appears to be one screw holding the system board to the lower case, with the board facing up, look in the middle and toward the top right edge of the board, there is a screw along the right edge. 2nd hole down, remove that screw and lift the right side of the board. Make sure all the wire and flat cable connections have been removed.
Does it not seem to get power? This is a common issue with the S149. If you have a charged extra battery or one from a similar Toshiba laptop like the S311 you can see if it starts with a charged battery. If it does the problem is likely the soldered connection on the motherboard for the power cord. This commonly breaks and causes the laptop to not run off the power cord and not charge the battery, but it will run from a charged battery. If this is the case you will need to resolder the power connector to the motherboard. The laptop must be disassembled to make the repair. If you do not have the tools, knowledge or experience to do this or the solder job then you will need to locate a technician that can.
Before going for the upgrade make sure you read the specifications as to how much size your system supports, Then take your laptop to the authorized vendor and ask them to upgrade it accordingly so that you do not have any compatibility issues later.