I already faced a problem like this before 2 times. First time. It was a Dell laptop, when I pressed the start button, It gave me the dell logo then a black screen ... can't go to windows or even to Bios .. no F2 no del no options at all. I just removed the external Battery and the Bios Battery as well, and then I turned the Laptop on ...Then the laptop works and still working very well . (don't forget to return the Bios battery back to it's place). B) Second time. It was a Desktop PC ..when I turned it on, nothing but the CPU fan operated, even the monitor there wasn't any signal. I tried every thing you can imagine, I replaced every part of the computer to test it except the motherboard, unfortunately nothing happened. Something may helps you to know if the motherboard is bad or not, As I did in my case, Is to remove the CPU fan then start the PC and put your finger on the CPU and notice if the CPU temperature increases or not, If not, This means that there is not enough power going to the CPU to wake it up. so you have to replace the motherboard, this is what happened with my fiend's PC . NOTE: If the CPU temperature increased(this is the normal and should happen in any computer), you should immediately unplug the power cable(cut the power) to save the CPU from burning , and then return the CPU fan back. Thats all I hope it helps Good luck