Is there anything dangerous inside old electronic equipment (computers etc) that a child should not touch?

Older electronic equipment can have lead in the solder that holds components to the circuit boards. I doubt if there is any mercury in there although mercury switches were used in OLD industrial equipment.

The lead levels are not high enough to worry about unless your child does this every day for a long period of time.

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there may be some hazardous substances in old electronic equipment I'd be more worried about a child getting zapped by a capacitor though

Yes, they are very dangerous and your husband was right.