Burn LION (in Applications folder) to a DVD disc. See if what you get is usable to reboot the computer.

It may not be perfect, but this may give you enough to work with should your computer crash (i.e. access to disk utility for repairs, etc.).

If this does not work, the most you are out is the cost of a disc (and your time).

grin


https://support.apple.com/kb/ht1479

http://docs.info.apple.com/article.html?path=mac/10.4/en/mh854.html