If you made it to a TTY screen, then the processor works. What might not have been assigned was the specific GPU device ID that the system uses as there may not be an entry in xconfig app to get X11 setup correctly.
Here is a script you can use to tell us your GPU information. We can decipher the information and possible adjust xconfig if driver support exists.
#!/bin/sh
pciconf -l | grep vgapci | \
while read -r line; do
dev=$(echo "$line" | awk '{print $1}' | sed 's/:$//')
echo "==> $dev"
pciconf -lv "$dev" | grep -E 'vendor|device'
echo
done
