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Bios Screen and boot manager do not appear

ashafeek
Level 7
Hi,

I built my new pc 3 weeks ago, suddenly today, No splash/bios screen shows up on boot and after seconds/minutes with black screen then welcome windows screen showing directly.

Sometime the black screen takes a very long time without any response on the monitor and I get varying error codes on the motherboard's digital screen; most often my pc take a long time with A2 and some times with Ad codes. I googled a bit and these errors seem to be related to the OS disk, but the system boots most of the time after the black screen and I did a lot of disk diagnosis and found nothing wrong with my disks.

I Have Asus ROG Strix z-490e, i9 10850, MSI RTX 3090, 1TB Samsung 970 EVO Plus M.2 SSD, 6TB Toshiba X300 7200RPM SATA HDD.

Please Help, I am a Graduate computer science student using the computer for deep learning and my finals are coming and i cant get to the bios or my dual boot menu to access my programming OS.
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