boot failed

I got a server from work, I installed an SSD and Proxmox. Everything worked. I swapped out the Raid card for an HBA card. When I did I get 4 beeps on the boot and nothing. (all beeps are the same length so manual was no help) No bios boot screen. To test: I swapped the video card and HBA...

Hello, My old PC stopped booting one day without explanation. Its fans keep spinning, the hard drive and DVD drive are powered but not the keyboard and mouse (their LEDs are off), and the screen remains black (no signal). The motherboard's phase LEDs, which according the manual indicate the CPU...

Laptop (Medion Akoya) got dropped, after that I started it and i see Checking Media_ at the top left and it goes to efi network 0 for ipv4 (7C-D3-0A-00-60-39 boot failed and efi network 0 for ipv6 (7C-D3-0A-00-60-39) boot failed. In the bios there is also no hard disk indicated. I already...