In this case, you can either replace your laptop's display or visit a service center to get dedicated assistance. Step 1. Connect the external monitor to the Laptop. Step 2. See if the computer screen displays on the external monitor. If not, then press " F4 " until the screen image displays. Step 3. Model: Acer Aspire S7-391; 256GB SSD/4GB RAM; OS: Windows 10 Before going dead, the laptop used to randomly display 'no bootable device found' warning while turning it on. But usually it booted up Acer Aspire s7-391 BIOS recovery. Ask Question Asked 7 years, 9 months ago. Modified 3 years, 2 months ago. Viewed 6k times AxQOmKb.

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