I have a blank screen when I start up my Lenovo SL510 ThinkPad. The system starts fine but it is a blank screen

Unfortunately it's not something that can easily be found as we cannot see what you see?
A quick google search has lead me to believe it is on the right hand side of your laptop, near your CD drive, it is a small slot that could be covered with a plastic covering (it protects from dust)

You will need to replace the keyboard, but since there is a mouse problem also, I recommend the laptop be checked for motherboard damage by a computer repair shop. What ever moisture got in will need to be cleaned up.

F1 before boot

It could be that the machine is overheating, if it's shutting down. Try ensuring that the vents are clear of obstruction, and that they are clean. If you can get to the cooling fan, then ensure that this is also clear. Don't use the laptop on your lap, as this tends to block the cooling vents as well.

It may also be worth checking to see if you get any error messages before it shuts down - in case it's something different (although I know that Windows 7 doesn't have an SP2 yet - so are you using Vista, or 7, SP1?)

http://www.google.com/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=1&ved=0CEgQFjAA&url=http%3A%2F%2Freviews.cnet.com%2Flaptops%2Flenovo-thinkpad-sl510%2F4507-3121_7-33776133.html&ei=Fj7MTrScI8yNsALjuIDzDg&usg=AFQjCNHTYYDMMPgSPozB3Zfnc8h01avPNA&sig2=COe2bNPwfg5Pr4SpdKU0eA

The problem with the LCD, or LCD inverters connection. sometimes, rarely, drivers.

you might have installed/ activated the login security software by mistake..

try to recall the password.. if it doesnt open then try to access the laptop through LINUX LIVE CD, backup all your data and then format and reinstall the OS. .

if the security software has encrypted the drive then you are screwed till you recall the right password.

What operating system are you currently using?

If you are using MS Windows, here is a link to all the correct win drivers for the lenovo SL510: http://www-307.ibm.com/pc/support/site.wss/MIGR-73445.html On this page, click the "software" link, where you will find "Integrated Camera Driver".

If you are using a Linux distro like Ubuntu, the webcam should work automatically, you may just need to configure/activate it using the software you wish to use.

Hope this helps ;)

try hitting F11 repeatedly when you first turn it on to access the recovery partition.