External monitor issues with new OS

Since switching to the new OS Lion I can't get my external monitor to work through my Toshiba docking station.  It used to work??

I have to use an external monitor with my macbook pro because the screen stopped working a couple months ago. I think the problem with the screen is just a loose connection for the light source because the computer works fine otherwise.  The repair people in town say that it's a bad logic board which will cost 700 euros to fix so I've been using it closed with the monitor and a bluetooth keyboard and trackpad.  I installed 10.9.2 the other day because I had been using 10.6.8 and there was some software I wanted to use but it needed 10.7 or later. I just assumed 10.9 was safe or better than 10.7 or 10.8 and I didn't do any research or even try to buy or DL them because the links on the apple site led me to 10.9 and I just blindly followed.  So NOW when I open the lid to my macbook pro, the menu at the top of the monitor goes gray and the monitor flicks off for a second, and when it comes back all the running applications have vanished from the desktop, (all the open windows) and I can't type, scroll, mouse.  When I close the lid it works ok, but I really like the isight camera and I think the microphone is better than the one on my external camera, so it was nice to still be able to use them.
I chatted with someone at apple for a while and he told me to erase my HD and install it again. He said the problems were because I installed it on top of an old OS and that a fresh install will fix all the problems.  I have an empty partition on my mbp and I'm about to try to install on that drive and see if it makes a difference, but I don't totally trust that guy.  I read the transcript of the chat and he gave me a lot of conflicting info.  Does anyone know if it makes a difference to install os 10.9.2 on a totally blank drive, or will the problems on the other partition corrupt everything else?

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