I just replaced a dead Radeon 5770 with a FGX 680. Now my Mac won't boot from its SSD drive. The Mac will boot from the HD in bay 1. It sees the SSD and Disk Utility says it's OK (repaired permissions + verified disk). If I start from the SSD, it stays stuck on gray screen Apple logo. The SSD is a striped raid (Crucial MX500) in a Apricorn Velocity Duo PCI card. SMC reset, PRAM reset. Any suggestions on next step?