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cooperlaa

Sierra only boots with usb plugged in otherwise black screen for gt 540m

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Sierra only boots with usb plugged in otherwise black screen for gt 540m

Hi ive somehow manage to get a compal pbl21 with 540m graphics fully working with Sierra O's apart from having to buy a wifi dongle but if i boot without the usb installation stick in i get black screen. I installed clover Uefi i think

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