Question no beep on startup and no display

[kamithegr8]

my computer was working absolutely fine after i got a new graphics card. next day, i tried to boot it up and it just showed no display. i tried using my dads hdmi cable and monitor, that didn't work either. I tried running the pc with the integrated graphics, that didn't work. i tried cleaning the ram, cleaning the motherboard, cleaning the inside of the pc, checking all wires were okay and connected, they were.
I then bought new ram and a CPU (made sure they were all compatible) and put those in. It then worked! Until I tried catching up with updates and my PC needed to restart. After that, it just never turned back on and I went back to the start with the no display message and no post beep.
Incase it was a problem with the motherboard i then bought a new motherboard and connected everything correctly. Still didn't work. Changing the CMOS battery also did nothing.
Finally I bought a new PSU. still didn't work.
Even bought new wires. It would just turn on, all the lights would be on but there'd be no beep and the fans would suddenly go really loud for a second then go quiet again. there'd be a no display on the monitor and it wouldn't even load BIOS.
specs:
Motherboard - gigabyte AMD GA-78LMT-S2P
CPU - AMDFX 8350
2x8 GB ram hyperx fury
graphics card - radeon RX 6600 MECH 2x8gb
PSU - 750W semi modular CWT CSB series 80+ bronze
hard drive - CGATE barracuda 2TB HDD
Windows 10 64
Any help is greatly appreciated!

 

[CountMike]

my computer was working absolutely fine after i got a new graphics card. next day, i tried to boot it up and it just showed no display. i tried using my dads hdmi cable and monitor, that didn't work either. I tried running the pc with the integrated graphics, that didn't work. i tried cleaning the ram, cleaning the motherboard, cleaning the inside of the pc, checking all wires were okay and connected, they were.
I then bought new ram and a CPU (made sure they were all compatible) and put those in. It then worked! Until I tried catching up with updates and my PC needed to restart. After that, it just never turned back on and I went back to the start with the no display message and no post beep.
Incase it was a problem with the motherboard i then bought a new motherboard and connected everything correctly. Still didn't work. Changing the CMOS battery also did nothing.
Finally I bought a new PSU. still didn't work.
Even bought new wires. It would just turn on, all the lights would be on but there'd be no beep and the fans would suddenly go really loud for a second then go quiet again. there'd be a no display on the monitor and it wouldn't even load BIOS.
specs:
Motherboard - gigabyte AMD GA-78LMT-S2P
CPU - AMDFX 8350
2x8 GB ram hyperx fury
graphics card - radeon RX 6600 MECH 2x8gb
PSU - 750W semi modular CWT CSB series 80+ bronze
hard drive - CGATE barracuda 2TB HDD
Windows 10 64
Any help is greatly appreciated!

That MB probably gave up the ghost, it's VRM was inadequate for 8350 even when new.