Trying to re-install Snow Leopard over Lion and Macbook Pro is beeping like a memory failure

I installed Lion on my work 15" MacBook Pro i7 to give it a go, and it's not working with the system we use for Active Directory login, so I need to roll back to Snow Leopard.
I don't have a Time Machine backup, but I have pulled all the data I need from the machine, and have wiped the hard disk ready to reinstall Snow Leopard.
I have a retail copy of Snow Leopard that I've recently used successfully for fresh installs on other machines, but now once I insert the DVD into this machine that's had Lion on it, it's not responding and just making alarming BEEP BEEP BEEP noises.
I googled that and it might be bad RAM (possible, but unlikely? the machine has been running very well up until now)
I've wiped the PRAM, but the instructions for wiping the SMC are a bit cryptic for these machines ...
Does anyone have any clues as to what might be causing this? A firmware issue of some sort?
Maybe the hidden EFI partition on the drive won't let you install Snow Leopard over a disk that's had Lion?

Might be some useful info here:
http://forums.macrumors.com/showthread.php?t=1175934
" I used target disk mode to install Snow Leopard on its partition. I used a friends Macbook Pro, but I put my machine into target disk mode and ran the installer from his user account and optical drive. From a couple things I read online, it seems that Apple recommends putting the other machine in target disk mode and doing it the other way around. I guess some critical files might not have been installed? I also used a retail copy of Snow Leopard instead of my grey recovery disk, so that might be it too. "
"Your machine is newer than the retail copy of Snow Leopard. Use the restore disks it came with.
The installation will need to be done from your machine. You may need to do a net install, so look at "Remote Install Mac OS X" in Utilities."
I'm currently installing from the macbook firewired to the other machine as recommended so hopefully that might help

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