Mac Pro 6,1 Definition leaves monitor with no signal on boot

[troyjr4103]

Hi i just recently made my hackintosh and I got everything working and then i decided to change my definition to Mac Pro 6,1 which now leaves my computer unusable because my monitor has no signal. Is there any way to fix this or change the definition in boot? Or boot my computer to change the definition in multi beast? Ive tried all common boot flags but nothing works...help please!

 

[aopisa]

Boot using your USB drive and change your definition in the smbios.plist file. To what definition I don't know since you supplied no information on your system. Safe bets would be the default 3,1 or whatever you had before or possibly 14,2 which seems to work well for a lot of configurations.