I do not know about the defogger kit. I know it works. I have never done it and never had problems overclocking. Some say it will last forever. I forgot to ask earlier. What is the voltage you are running. That is the only thing that I can think of. You might need to up it. I hate to say it but if you already have the voltage at 1.85 and you are still getting the no boot screen, it might be all your cpu will do. Most of the durons max out between 850 and 1ghz. Most do not go 1ghz. It could be the pencil so you could retry but it sounds like you found the limit of the cpu. sorry