year old computer working fine up until two weeks ago. 1-lost F2 key functionality in Excel 2-lost 1 HD. Have Samsung 950 Pro 512 GB m.2 NVME on mobo as boot drive, 2 HDs for storage. Would only recognize 1 of the HDs. over the last week. 3-started being slow to load utube videos, 4-today wouldn't load windows 10 64 bit. Only recognized 1 HD, no SSD recognition. Can't get into BIOS because F2 and Delete keys don't respond. What to do first in checkout?