Beep codes for MSI motherboards.
https://forum-en.msi.com/faq/article/bios-beep-codes
There's no code that's 1 long + 7 short... you might need/want to post this on MSI's support site. That said, nothing with 7 beeps is good.
Anyway; take out or uplug everything but RAM/CPU, plug a monitor into the onboard video, reset the CMOS, and try to boot it. If it works, add one component back in at a time until it breaks. If it doesn't work, it's your RAM, your CPU, or your motherboard. Start with new RAM.
If your computer was hit by lightning, just replace all three, and the PSU/GPU.