The only Sonnet CPU I have that is non functional is a G3-500 for a PCI Mac, looks fine (was missing a capacitor that I replaced) , but is dead and I got it that way. Sonnet made a million of those 7500-9600 PCI Mac G3 cards.

Having a Dual G4-1.1Ghz blow up only after a year is very bad news, they were never that common. Maybe it can be fixed?