I think it is the power cord but don't know where to buy a new one. can you help me?
It's doubtful that the power cord is at fault; about 3/4 of all complaints regarding an inability to turn on are due to a failed main power supply; wish I had better news for you.
For a tech with a few fairly common instruments, troubleshooting this is no big problem but without some background and those couple of measurement devices, your chance of finding this problem and correcting it permanently is poor.
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