First when it happened, the display shows the last number I keyed in. However it didn't respond to the keyboard. Then I switched it off, unplugged and plugged it back, the same problem happened - there was a display but it didn't respond to the keyboard. The next day, when we tried to switch it on, there wasn't a display at all i.e. appeared to be no power. But why the day before it just froze with the display on but not responding to the keyboard and then now seemed like no power?
I will try to test it using different power outlet.
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