Mario recently replaced his hard drive with a Samsung Solid State Drive. Then he upgraded to Windows 10. The computer went to sleep. And now it won't come back on. He managed to get a boot menu by pressing F12. But nothing else. Leo says that means the screen is still good. But it could also mean that the hard drive died. Even though it's new, they can die out quickly. If your computer is old enough, it could be the CMOS battery has died and needs replacing. Check the date/time in the setup. If it thinks it's 1969, then that's what happened.
John is having an issue with his optical drive on his computer after a Windows 10 update. Leo says to check the cables to see if there's a bad cable first. Since the EFI Setup/BIOS doesn't see it, then that points to a hardware issue. It could be a bad board. He should try clearing the ESCD data in the memory. That could help. He can look in setup for it. There may also be a jumper on the motherboard to do it. If he still can't see it, then it's likely a bad CD player circuit board. The good news is, CD players are cheap.
Daniel's PC says "boot device not found" when he turns it on. He checked all the cables and pulled the battery. That only worked once, though. Leo says that the battery is likely starting to fail and if that happens, it won't save the settings in the computer. Daniel should check the BIOS for the Enhanced System Configuration Data (ESCD) and reset it to default. Once that's done, reboot. After that, he may need to reinstall Windows.