I have an Hp 425 notebook. Recently, it was unable to power on at all. I did a hard reset and was successful. Unfortunately, after it was powered down and I tried to turn it on again it didn't work, so i did another hard reset and it did turn on. However, after that it no longer powers on at all, even after i did a hard reset. When I try to turn it on the power light blinks about 12 times in a yellow colour and then once in a white colour. What I find strange is that when the power cord is connected, the power button does not respond and no lights blink at all when I press the power button to turn it on. Can anyone give me any possible ways to fix this. Any help will be appreciated