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I have an Atari 1040 STFM that's been sitting in the basement for about 30 years. It doesn't power on. The power indicator light is not illuminated and there's a high-pitch noise coming from the power supply. The power supply looks great -- nothing looks out of the ordinary. Any suggestions on what to look for? Can the supply be replaced?

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    Either the supply itself is faulty, or the supply is OK but a fault in circuitry it powers such as short circuit makes the supply emit noise.
    – Justme
    Mar 24 at 9:27
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    And the first step is to check all capacitors. Most of the time it's failed capacitors.
    – dirkt
    Mar 24 at 9:58
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    Power supplies (rather the coils in there) tend to whine when the load exceeds their maximum - You shouldn't keep that thing switched on for too long. Very likely, the fault isn't even on the power supply, but rather on the main board of the ST - And again, very likely, it's caused by a shorted cap.
    – tofro
    Mar 24 at 10:17
  • Have you measured the output on the PSU to see that the voltages are within spec?
    – Edders
    Mar 24 at 11:44
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    When the PSU is plugged into the main board, the 5V and 12V read 0. Unplugged it reads 5V and 12V. I'll take the ST apart a little more and examine the main board.
    – Chocula
    Mar 24 at 15:43

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