Lexmark E320 panel light problem

I have had my Lexmark E320 laserjet for the past 8 years and it has operated flawlessly whenever I turned on the power button.
This morning I turned it on and all the panel lights lit up and stayed on permanently. I checked all cables and they are all connected correctly. Tried a different USB port on computer but no difference.

Tried restoring the factory defaults by:
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To enter the special function menu:

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1

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2

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3

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operator panel button twice quickly (double-button press).

Lights just stayed on with no change.
Any ideas...thanks.....Robert
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Sounds like a hardware error. Probably the last thing you can try is to disconnect the power completely and let stand for a few hours. Plug it back in and see if its any better. If not, there's probably not much you can do especially for an 8 year old printer.

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Thanks for your reply. The printer had been turned off for about 10 hours overnight just before I turned it on for the first time this morning. The panel lights all stayed on right from the beginning. I supect your are right.
Cheers...Robert