If your Dell laptop won't turn on at all when you press the power button, try a few simple hardware checks first. Check if the laptop is plugged into power with a charger that is working, and that the battery isn't empty. Hold down the power button for 1015 seconds to force the laptop to shut down completely, then press the power button again to turn it on. If the screen doesn't show anything while the fans are running, disconnect all peripherals and power, and hold the power button again to release any residual charge before you connect the power again. In cases where the screen is still black or there is no response, you may try to reset the BIOS settings to default by disconnecting the battery (if you can) or get in touch with Dell support for hardware diagnostics. A restart like this will get your Dell to work again without changing the operating system or files. These are the ways you can start a Dell laptop.