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Re: Optiplex 755 USFF will not boot after changing cmos battery

As long as the controller mode is set to ATA, that 0x7B error should not be happening. Unless, that is, there's a problem with the drive itself or the boot sector. Given that you've tried three drives, I think one of them has got to be good. So that leaves the boot sector. Are you deleting ALL existing partitions when you start the installation process?


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