Internal SSD not detected in boot or lsblk

I had a Linux mint system which was working fine until it froze and the "safe restart" of alt+Sysreq+REISUB didn't work, so I had to hard shutdown. After this the bootable SSD stopped getting detected at boot, even as a storage device. I bought a new SSD - it was detected the first time as storage, but the second time it stopped showing in boot. I tried lsblk or fdisk -l with live USB but it failed to show. The live USB works fine so the motherboard is fine, the data cables should be fine too as before the system froze there was no such issue. What other problem can there be?