There is no problem on board but "No Bootable Device" display on the screen. Harddisk and dvd rom do not appear when i enter bios. I also made the necessary adjustments from the security settings like UEFI. But there is no bootable device. The voltages are normal, nothing came to my mind apart from the bios malfunction, if anyone has an idea, please help. device is acer aspire vn7-571. Mainboard is Hades_840m_mb 14205-1. 448.02f09.0011
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