I had that happen in the past.  As it turns out, the power supply was 
not fcc type excepted.

On 8/6/2014 3:29 PM, Howard Kaufman wrote:
> I had to replace the power supply in my main computer today.
> Now the computer works, but I have birdies all over the broadcast band.
> Haven't turned on the HF station yet.
> Will one of those RF line filters help?
> Is their anything I can do besides replacing the supply again?
> How do I know the next one won't be worse?
> I imagine they are all switching supplies these days.
>
> H T Kaufman MSW LCSW
> Adaptive Technology Instructor
>
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