MackBook Pro Clean Install Issue?
Sorry I don't have the reputation to comment yet.

Is this a standalone copy of SL or is it from someone else's Mac? The included disk with another system is not guaranteed to work with a different model of Mac.

Have your tried erasing the HDD again from Disk Utility, be sure to select the drive(not the indented logic drive) and let it rebuild the GUID again.

You can also try an NVRAM reset before running the Installation(Instructions Here) in hopes that will solve the video issues you run into.