The beeping indicates that there may be a hardware issue with your laptop. Please check the laptop’s manual for more details, but usually when it comes to Toshiba computers, the continuous beeping may indicate a Keyboard error or a RAM problem.
Can you notice any signal on screen when you press the power button? If no, you may be facing a motherboard or a RAM memory issue. You may need to seek assistance from a technician. If the laptop is under warranty, you should contact the seller.