Help with installing OSX Lion on iMac with broken display

Hi,
Having some trouble installing OSX Lion on my 5 year old iMac which has a broken display.
The display has been dead for a couple of years now and I've been using an external monitor without any problems. Today I decided to upgrade to Lion - I downloaded the installer from the App Store and started the install which rebooted the machine. After reboot I'm presented with a grey 'thatched' background image on the external display and nothing else, no menu bar, installation menu etc.
I presume the internal display is showing the menu I need but I can't see it as that screen is broken. Is there a way to turn on mirroring during the install process so I can use my external display? I've tried various shortcuts held down during startup - OPTION-F14, CMD-F1, CMD-F2 - but none have worked.
If this isn't possible, is there a way to abort the Lion install process and go back to using my Snow Leopard install? Whenever I boot the machine I am taken to the OS X Lion installer and don't know how to get back to my Snow Leopard install. I tried holding down OPTION key on startup to choose the list of available OS installs, but again, the internal display is being used so I can't see what to do.
Thanks in advance for any help.

Genius idea, thank you. Was able to step through the install procedure using voiceover and the screenshots on this page http://www.macstories.net/mac/os-x-lion-installation-guide-boot-discs-and-qa/
Definitely a first for me, installing an OS with voice only

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