My sister has an i5 3500 (?) on some gigabyte board with 4 sticks of 4GB RAM. It's been working fine until this morning when it was stuck on the BIOS splash screen. She said she left it on overnight and told me it did a Windows 10 update overnight.
At the BIOS screen "delete" won't go into the setup, and none of the other options (F12 for bootup options) work. The keyboard is registering because ctrl alt delete does reboot the machine. I pulled all the RAM out and tried each stick 1 at a time, no luck.
I'm thinking a hardware issue? Maybe the mobo? Thanks!