in case you feel comfortable opening it up, there is a chance that this is actually a cable issue and nothing serious. the statis buzz you're hearing is probably a software crash which results from the keyboard controller "disappearing" suddenly. this might happen when the connection in between the motherboard and the keyboard controller is compromised by a broken cable or even a loose (ribbon) cable.
in case the keyboard controller is damaged: after so many years, a possible repair will not be for free but since the keyboard controller isn't considered to be an expensive part and is easy to be exchanged you might get away with moderate repair costs.
if the motherboard is damaged you will run into a problem. there are no replacement motherboards left. we cannot manufacture new ones anymore for various reasons including a EU regulation which prevents us from using components which contain lead. the only way to fix a virus b series motherboard today is to send it to germany and we will attempted to repair it.
marc
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