Sun Ultra 10 doesn't boot

I have a Sun Sparc Ultra 10, and it doesn't complete the boot: usually it doesn't turn on monitor, and sometimes it gives me OBP prompt with message "Watchdog reset".

Once I gave the test-all OBP command with the following answer:

Testing /pci@1f,0/pci@1/pci@1/SUNW,isptwo@4

Selftest failed. Return code = 4026718912

Externally Initiated Reset

Does anybody know what could be wrong?

What does "Externally Initiated Reset" means?

Thank you!

[490 byte] By [andesena] at [2007-11-27 0:44:48]