You also might want to try to test the power supply to see if it hasn't died. The power supply can be replaced. Clean and test everything first before giving up hope.
If the motherboard has died, then yes, the latest WinUAE and a SCSI card will work with your Amiga formatted SCSI HD (just as long as the RDB is intact). Then you can turn on 68040 w/JIT emulation, install Picasso96, and have a totally faster running "Amiga".
