Question CPU Light on new PC Build - help

[TolgaK]

Hello, recently built the following pc
- MSI PRO Z790 A WIFI DDR5
- 14700KF
- Gskill Trident Z5 RGB 2x16GB 6400MT CL32
- EK Nucleus 360 RGB AIO
- Samsung 990 Pro
- Corsair MP510 (reused)
- SATA SSD (reused)
- 2x HDD (reused)
- Corsair RM850X PSU
- NZXT H440 (reused)

Put it all together, wiped off the preapplied thermal paste and applied thermal grizzly instead. I turn it on, everything lights up, but it doesn’t post and the CPU Red light stays on.

Have tried:
- flashing BIOS to latest version using Flash BIOS button and 2 different USB sticks
- reseating the CPU (to which there was some extra thermal paste on the edges of the CPU, but it’s non conductive thermal paste)
- switching the ram sticks around and only using one in the a2 slot
- unplugging all 3 SATA drives
- checked all power supply cables were deeply in

Not sure what the problem is! Can anyone help?

 

[rgd1101]

what the gpu?

 

[TolgaK]

what the gpu?

ASUS RTX 3060 Ti

 

[rgd1101]

is the aio cooler working? connect to cpu fan port on the motherboard or whatever on the instruction?

 

[TolgaK]

is the aio cooler working? connect to cpu fan port on the motherboard or whatever on the instruction?

It’s plugged in, but shouldn’t make a difference anyway as CPU won’t heat up sufficiently if it’s on for less than one minute?

 

[ohio_buckeye]

But you did plug it into the cpu fan header so the system knows there’s a cpu fan? First thought would have been bios but you said you tried that. Any bent pins in the socket?

 

[TolgaK]

But you did plug it into the cpu fan header so the system knows there’s a cpu fan? First thought would have been bios but you said you tried that. Any bent pins in the socket?

Yes, the pump is plugged into the PUMP_FAN header, and the 3 radiator fans are plugged into the CPU_FAN header