Why is my laptop not coming on when pressing on?

It sounds like your Asus A540 laptop might be experiencing a hardware or software issue. Here are a few things you can try to troubleshoot:

1. Check the power supply: Make sure the laptop is properly plugged into a power source, and check if the power adapter is working (you might want to try a different outlet or adapter if possible).

2. Battery reset: If the laptop has a removable battery, remove it, then hold the power button for about 15-20 seconds to discharge any remaining power. Reinsert the battery and try turning it on again.

3. Perform a hard reset: If the battery is non-removable, unplug the laptop from any power source, hold the power button for 15-20 seconds, and then try powering it on again.

4. External display check: Sometimes the screen might be the issue. If you have an external monitor or TV, try connecting your laptop to see if it's a display problem.

5. Inspect for overheating: If the laptop got overheated, it might have shut down to protect itself. Let it cool for a while and try again.

6. LED indicators: Check if any lights appear on the laptop (like power LEDs or keyboard lights). This might give you a clue whether the laptop is getting power but failing to boot.

7. Hardware failure: If nothing works, there might be an issue with the laptop's internal components (like the motherboard, RAM, or storage). In that case, it might need professional repair.

Let me know if any of these steps help, or if you're seeing specific lights or messages!