I removed the battery and charger once and held the power button down got 30 seconds. It turned on. I left it connected to the charger overnight as my iPhone was backing up.
But in the morning the display was showing disturbance when I moved the cursor. I restarted the laptop once but the display disturbance didn't correct so I shutdown the laptop.
Now it's not switching on even when I remove the battery and charger and press down the power button for 30 seconds.
Could you describe me that disturbance? Was it like a screen problem or the whole PC seemed irresponsive? If the laptop is under warranty, I strongly recommend you to call the seller and ask for guidance. If warranty has expired, you should check the motherboard and the power button. Holding the power button for 30 seconds was a good decision and sometimes really solves startup issues. Sadly, your PC may be suffering from a hardware failure.