It means putting your components on a non-conductive surface and powering up bare minimum of components to see what the results are. The idea is to see what happens at each step, if results are good add another component and try again. You keep going in steps until you narrow down which component is giving you grief. Unfortunately, for me anyway, there comes a time when the only definitive way to solve the issue is to take a guess and replace the component you suspect the most. Google really helps out in these situations. Here is a bit of a motherboard troubleshooting guide taken from the Asus forum that will be relevant for other brands as well;
ASUSTeK Computer Inc.-Forum- ****************************Bad BIOS Flash and Dead Board Testing. ***** ALL Boards *****
Check your manufactures websites and forums for people who have had similar problems, you may find the answer you need there. Good luck!