You might try pulling the plug on the unit and leaving it overnight. The electronics may have locked up due to irregular voltage during the failure. There may also be a GFI (ground fault interrupter) on that circuit that has tripped for the same reason. Check the kitchen outlets for a tripped GFI.
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Having the unit sitting on the counter would make this easier but you will have to remove the housing to proceed.
If you are lucky, a main fuse (inside) has blown quickly enough to protect the low voltage circuitry but this is not generally the case.
Much of the circuitry involving the magnetron is by nature, more able to withstand a high-voltage transient coming in on the AC line but the control circuitry cannot.
There is normally a few cheap components that will protect the unit from low-energy spikes but lightning isn't in that category and I think the digital section (display & controls) has been damaged and the way they are assembled doesn't lend itself to repair at all.
This would mean that the electronics (normally a single board) would have to be replaced and despite the value of the board and its components, the cost (probably over $100 US) will cause you to weigh replacement of the unit.
If you own your home, I highly recommend the installation of a whole-house surge protector.
If you are capable of installing electrical devices (must be near the breaker box), the cost will be under $200 US and a competent electrician can install these for $50-$75 US in ~ 1 hr. IF you have two open (unused) breaker positions in the existing box since they require adding these.
They will provide protection of AC lines, phone lines and cable/satellite TV lines.
The company whose unit I bought offers $10,000 insurance included with the price and for 5 years; meaning, they will pay for replacement of devices damaged despite the correct installation of their product.
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