Hi all,

My T310 Power Supply No 1 has started to give off a high frequency tone, when plugged in, even though PSU 2 is doing the work. When unplugged at the IEC connector, nothing changes. When the PSU is removed however, the whine disappears. No green lamp on PSU 1 either, when plugged in.

Is there a simple explanation, like buy a new PSU for No 1 of is this a possible fix?

Thanks