The power supply in my 240 up and died on me last night. I've been searching for a cheap replacement and I did find some on ebay. However, there are power supplies for several models currently listed, but the prices vary a lot. One listing states that the ps will work in the 240 and 540 models as well as a few other models. That one would cost me about $45. There's another listing for a ps for a 540 that would cost me $21, but I may be able to get my hands on a 540 power supply for free. So the question is - Can I use a power supply from a 540 to replace the bad one in my 240?