You have to plug the Sandy Bridge back in, so that the system boots up. Then go to asrock.com and download the latest BIOS version, then follow the instructions. After you've updated the BIOS, try the 3770K again. Make sure you haven't gummed up the IHS or cooler or socket with too much thermal paste by now ..
In the future, you probably want to ask or read here before upgrading - life would be so much simpler with a little foresight & planning ..
As for Fat32, that is the old Windows storage standard (File Allocation Tables part of the file system), that Windows 3.1, 95, 98 et al (and DOS too) could understand. When Windows NT came out 18 years ago or so, it used a more robust file system called NTFS (New Technology File System), with a master boot record, etc.