HS safe mode troubleshooting

I set my SMBIOS to iMac 11,1 and was able to install HS with my GTS 450. But i was able to boot in only through safe mode. Then i installed nvidia web drivers but couldn't installed bootloader. I rebooted with safe mode and the graphics was glitchy. fullscreen Youtube stutters (tearing)... What can I do?

submitted by /u/nithnithin7
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