Dell Studio Laptop Not Turning on

[RossComputer]

Heya Tom Community i have a Dell Studio laptop and sometimes i will turn on no problem and other time i press the power button and nothing happens like theirs no power going to the laptop even thow there is? We took it to a shop to get it looked at and they couldn't find anything wrong but there is so i was hoping people on the internet could be smarter

Any help most grateful

 

[hang-the-9]

Could be a loose connection, is the battery OK? Have you tried a new power supply? Running only on wall power with the battery removed? Is that the only issue?