Apple has admitted that there is a problem with "a small number" of its eMacs.
Apple’s KnowledgeBase technical issues database describes the problem as "a popping sound followed by a visible flash” inside the iMac's case that prevents its operation.
The problem occurs after the power button is pressed. The eMac was originally developed for schools but was later also offered for sale to consumers.
Apple is advising that owners of eMacs suffering from this problem should use an Apple-authorized service provider to remedy it.
Apple UK sources have confirmed that isolated incidents have been identified in the US, but no similar incidents have been identified in the UK market at this time.