Hi my name is ***** ***** I will be the expert working with you today to help and resolve the problem you have posted.
how old is the computer
When you try to switch on the computer does the power supply fan move or try to start?a
we need to verify the motherboard is good or not.Unplug all the wires and connectors from the motherboard only the power supply connector and cpu fan connector must be connected.Remove the memory sticks as well. Try to power on let me know if the fan stays on and do you hear any beep codes?
which light goes on and off?
did you remove the RAM and did you follow the the steps i gave
when you power on the computer do you hear any beep codes?
Just to let you know if he motherboard is not producing any error/beep code that means the motherboard is bad.
sure you may try and let me know