Check the fuse first.
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Thansk for your reply. The fuse is not in a glass tube so I cannot see if it is blown. I do not have a multimeter so I will need to borrow one to test. The last time it happened, I replaced the fuse and upon powering up again, there was smoke from the power supply. From your experience, does the fact that the fuse went off - if that is the case - mean that something is wrong internally?
After the repair, they seem to have replaced it with a different type of fuse. The local agents the last time told me to replace it with a fast blow fuse but the current fuse is slo blo and says 1-1/4 a which I presume is a 4 amp slow blow fuse.