watrobkasmaczna, the idea about a reflow is that it reheats the solder. The theory is that fractures form inside the solder points on boards, which causes instability. By reflowing the solder, you could get rid of the fractures, and sometimes you can bring apparently dead parts back to life. But, there is a bit more to it than just throwing it in an oven :-) Check [http://en.wikipedia.org/wiki/Reflow_soldering|on here] on here for more information about reflowing. This [http://www.xlr8yourmac.com/tips/ibookg4_vreg_repair/ibookg4_vreg_repair.html|idea] or even [http://blog.mic-b.com/?p=199|this one] might be a better way of doing it, unless you have a reflow station. Hope this helps, good luck.