this issue is puzzling ... I would like to see a couple of logs ... but guess you have problem publishing them... i.e. no cmd line, no connectivity ...
IIRC there should exist a command:
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that should allow you to temporarily switch to VESA (enough to start the graphics, the same you used when installing),
so log in as root and try that, at least things should become a little easier.
Once switched the driver, reboot.
Other than that, please let us know:
if you are currently running another system, i.e. Linux
if you have a USB stick storage available (we can instruct you to copy files there and then publish them from your other computer),
if the GhostBSD machine will be connected to Internet and how, wire, wifi ?
It will take a bit of time but we will get to end.