Today i installed Ubuntu 20.04 LTS to my computer with dual boot. I used Ubuntu for couple hours. But after that i closed my computer and did not use it for a few hours.Now when push my computer's power button, only thing that i see is black screen and i can not do anything. So even i can not reach my main OS (Windows 8.1) also i can not reach Bios and boot manager etc. I tried several times to open my computer but always i see the same thing. I guess i should use only Windows OS. So how can i reach my Windows and erase Ubuntu&Grub Menu?
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May I ask if this computer device of yours uses hard drive? It could be an out of the blue chance that the hard drive failed at some point in time moments before closing the computer, after you used the Ubuntu for the first time. I would also like to ask if it is an SSD and if so, how old is the SSD? Even a hard drive/SSD end of life scenario, the BIOS may not work. The reason being that in the case of an UEFI, the UEFI BIOS may be on the storage medium instead of on an integrated flash chip. This is typically the case in cheap or computers that came out around the start of the Windows support for UEFI era.
It could be possible that the device had the wrong BIOS settings in the first place. Take for example the scenario described on this support thread for the Lenovo ThinkPad P52. The issue described is almost like the issue you are describing. https://forums.lenovo.com/t5/Ubuntu/P52-Windows-10-dual-boot-Ubuntu-18-04-1/m-p/4160018?page=1#4186981 The thing is you may need to have beforehand turned off secure boot and UEFI in the BIOS.
A very unusual but possible thing could be your screen has gone bad.
Amol Soneji
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