Lenovo Laptop blinking keys but no display

I'm sorry to hear that your Lenovo laptop L380 yoga is having issues turning on. If the keys F1, F4, Esc, Caps Lock are blinking repeatedly, it may indicate a hardware problem or an error in the boot process.

Here are some troubleshooting steps that you can try to resolve the issue:

1. Disconnect all peripherals and remove the battery. Press and hold the power button for about 30 seconds to discharge any residual power, then reconnect the battery and try turning on the laptop.

2. If step 1 doesn't work, try connecting the laptop to an external display. If you can see the display on the external monitor, it may indicate a problem with the laptop's screen or graphics card.

3. If step 2 doesn't work, try entering the BIOS by pressing the F1 key repeatedly as soon as you turn on the laptop. If you can enter the BIOS, it may indicate a problem with the operating system or the hard drive.

4. If step 3 doesn't work, you may need to contact Lenovo customer support for further assistance or consider taking the laptop to a repair center.

I hope these steps help you resolve the issue and get your laptop working again.