360 Slim not turning on - yellow light on PSU - any ideas?

Hi all,

Hoping that someone else has come across a similar problem and can help me! The guides I've read so far only offer answers for PSU's displaying red or green lights, so thought I'd ask here.

My girlfriend's cousin went back to Australia at the weekend and left me his 360 Slim. He said that he had had some problems with it and that if could get it to work then I could have it.

I took it home and switched the plug (not the whole PSU, just the lead that goes into the wall) with a UK one. Turns out the problem is that the console doesn't turn on. The power supply unit shows an orangey-yellow light, but when I press the front button, or insert a controller, nothing.

I'm thinking therefore that it might be a problem with the PSU, but before I try replacing it with a new one (which might not even work, so want to make sure before I buy one), I wondered if anyone else had any ideas of what it might be (or can confirm it's a PSU issue)? Anything else I could try?

Thanks