Thank you very very much my friend for your help.I will try the EFI String for GFX thing and report back.

Another small issue i want to ask about,is how to use DSDT_patcher (because unfortunately in activity monitor the mac pc detects only one core and not 4),i have read that i have to use a pathced DSDT.
For that,do i have to enable it (tick it) during the installing menu-->customize of the ideneb? or i can do it even now through that process
cause in my root i cant find any DSDT.aml file hidden or not.

Thank you again.