Where did you buy it from?
I got a load of PC components from CCL once, and the PSU went faulty after 8 months (which also came with the PC case). They replaced it straight away (just the PSU, not the whole case, which saved me from having to strip down the entire system), no questions asked. Everything from CCL comes with a 12 month RTB warranty and I would assume that to be the 'standard' for any reputable dealer.
I'm not sure on the low level electronics stuff but I'm aware that a blown resistor can sometimes cause a 'whistle' noise as you described. Would that stop any power getting through? I wouldn't like to say.
I got a load of PC components from CCL once, and the PSU went faulty after 8 months (which also came with the PC case). They replaced it straight away (just the PSU, not the whole case, which saved me from having to strip down the entire system), no questions asked. Everything from CCL comes with a 12 month RTB warranty and I would assume that to be the 'standard' for any reputable dealer.
I'm not sure on the low level electronics stuff but I'm aware that a blown resistor can sometimes cause a 'whistle' noise as you described. Would that stop any power getting through? I wouldn't like to say.