Laptops :: hang on "scanning for harddisk partitions an creat

hang on "scanning for harddisk partitions an creating /etc/fstab..."

I have this problem with my laptop, a toshiba satelitte 1800-614. If I boot with "dsl dma" it works, but I can't mount my partitions, fat or ext3. When I try it, I receive the next message: "unable to mount this device at this time...".

What can I do? I want to install dsl on hard drive.

My laptop specification:
http://eu.computers.toshiba-europe.com/cgi-bin....MODEL=1

original here.