I have an old machine, around 11 years old. I revived it by installing more RAM and using Linux distros and it somehow serves as a backup machine for day to day activities. However, due to a screwed up monitor I didn't switch it on for a few months. Today, I purchased a new monitor and tried booting up the machine. However, when I press the power button it switches on, the fans turn on, and then within a few moments it switches off. And the same thing repeats until I turn off the main power supply. I tried removing the CMOS battery and putting it back again. I even checked all the RAMs individually. But it doesn't work. Any sort of help will be appreciated.