Performa 6400 Trouble

It only boots up to where it shows the date in the upper right, then locks the cursor.

I’ve tried booting from CDs with systems 7.6.1, 8.5, 9.1, and every boot key combination including zap pram, with same results.

Sometimes the boot volume will show in the upper right, including the first partition of the internal hard drive.

Sometimes Disk First Aid runs and says it’s fixed but still, just a blank screen, maybe one icon, the time, and a frozen cursor.

Must be some chip burned out but I keep wondering if it’s software planned obsolescence. The machine is dated 10/23/96! Hate to give it up. I use it for SCSI Drivers and its Audio-Visual capabilities.