My switch fell to pieces, so I am not sure just what it does, but it appears to be an off, on, on switch. Not knowing how the original switch acutally worked, I am assuming off meant off, nothing would start up, on 1 let the computer run but locked keyboard and mouse, and on2 let everything work. The cable connector to this switch is reversable with 9 pin sockets and 7 things plugging into it that could be reversed or moved around. Absolutely rediculous, to me to build a system with so little documentation, and so many ways to hook it up. If I try to fake the switch out, my power supply tries to start, but wont, go, i believe due to the FAIL not beingi hooked up right