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Apple Genius said that Snow Leopard won't install, and thinks it could be because of the drive and said they'll check if the harddrive is compatible. What could be the problem?
 
Apple Genius said that Snow Leopard won't install, and thinks it could be because of the drive and said they'll check if the harddrive is compatible. What could be the problem?

I don't really understand. Do you have a problem with that HDD? Have you formatted it correctly* via Disk Utility from the Mac OS X 10.6 Snow Leopard Upgrade DVD?
2009 MBPs were released before Mac OS X 10.6 Snow Leopard was even released, thus any available Mac OS X 10.6 Snow Leopard Upgrade DVD will be able to perform a clean install on any installed HDD, unless you have firmware issues due to having Mac OS X 10.7 Lion or OS X 10.8 Mountain Lion installed, but I don't know about that.

*
 
Ok nevermind the cable was out of order so the cable was replaced for under $20 and it works now.
 
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