When turned on screen stays black and no lights or sounds only power button and fan,, any ideas? i already did the basic checks

i already did the basic tests, external monitor hook up, checked the closed switch operation, checked all the accessible connection. acting like a motherboard or processor. looking for anybody that has come across this with a fix before i buy a new laptop i already did the basic tests, external monitor hook up, checked the closed switch operation, checked all the accessible connection. acting like a motherboard or processor. looking for anybody that has come across this with a fix before i buy a new laptop

Have you hooked up to an external moniter to see if you have video this way.This makes alot of differance in diagnostics. Have you hooked up to an external moniter to see if you have video this way.This makes alot of differance in diagnostics.