Four amber diagnostic LEDs translates to POST code FF. Doesn't look good, most likely the board is dead.
You can start with minimal configuration - one CPU, one DIMM and PSU, remove all other components. Try the Rolling BIOS Bank Selection Jumper: Move the jumper on J2J6 (next to the SATA headers) to position 2-3 to force the board to boot from BIOS Bank0.
You may also try BIOS recovery:=============================================================================BIOS RECOVERY INSTRUCTIONS=============================================================================1. Build Recovery media by preparing a formatted storage such as USB flashdisk-on-key.2. Rename ALIEF0xx.ROM to AMIBOOT.ROM and copy AMIBOOT.ROM to USB key.3. Set Recovery Boot Jumper J1D1 (10-11).4. Insert the Recovery DOS bootable media.5. Power on system; during recovery update no video will be displayed.6. Once flash udpate is complete, power off system and set jumper back toNormal mode J1D1 (9-10).NOTES:a. If system ROM is damaged (e.g. BAD checksum ), the system will performBIOS recovery automatically.b. Jumper J2J3 (BIOS bank selection override) should set to pins 1-2 to selectthe correct BIOS flash bank.c. The recovery only supports the storages of both type 12 & FAT16.d. DiskOnKey should have a FAT12 partition and be formatted in DOS. One methodis to boot with floppy and do the following at the DOS prompt:A> format b: /s . (DiskOnKey being device b: in this example).