Thanks to Overclockers for a totally no fuss, no nonsense RMA procedure under lockdown.
Turned on the PC this morning. It started up, but did not give signs of usual procedures, monitors, USB etc. I restarted. Nothing. Pushed the side panel off my case. Checked the code on the LCD display. "4d".
Started what I thought was a fairly sensible series of testing, unplugging power and waiting for board to discharge.
1) Unplugged all USB and monitors. - result 4d
2) Unplugged power, reset CMOS - result 4d
3) Took out one RAM stick - result 4d
4) Swapped the RAM stick to B2 socket - result 4d
5) Swapped in the other RAM stick to A1 - result - went in to a auto restart cycle.
6) placed the single RAM stick in to B2 - result 4d
7) placed a stick of Corsair Dominator 2400 1*8GB in to A1 (this RAM known to be working on another system)
Spec -
CPU: 3900x
MOBO: MSI X570 TaiChi.
Ram: 2*16gb Viper Gaming Steel 3200mhz
Graphics: Zotac 1080ti AE
Power supply: Seasonic
System has been stable since install in September 2019.
Apparently, 4d that's a "4D - OEM post memory initialization codes" issue. Further searches suggest from other's experience that there is some possibility with a CPU issue.
OCuk suggested that its either the memory controller on the CPU or the motherboard itself. Should be an easy test because it's not posting. OCuk requested that it gets boxed up with CPU in-situ. Support booked in a DPD pickup return tomorrow arriving Wednesday with OCuk.
adding to forum here in case it's useful for anyone in the future searching the 4d post code from Dr Debug's BIOS codes, and also to say thanks to OCuk for a hassle free set up of an RMA.
Will post any updates if it adds anything which could help future searches with similar issues to the above.
Turned on the PC this morning. It started up, but did not give signs of usual procedures, monitors, USB etc. I restarted. Nothing. Pushed the side panel off my case. Checked the code on the LCD display. "4d".
Started what I thought was a fairly sensible series of testing, unplugging power and waiting for board to discharge.
1) Unplugged all USB and monitors. - result 4d
2) Unplugged power, reset CMOS - result 4d
3) Took out one RAM stick - result 4d
4) Swapped the RAM stick to B2 socket - result 4d
5) Swapped in the other RAM stick to A1 - result - went in to a auto restart cycle.
6) placed the single RAM stick in to B2 - result 4d
7) placed a stick of Corsair Dominator 2400 1*8GB in to A1 (this RAM known to be working on another system)
Spec -
CPU: 3900x
MOBO: MSI X570 TaiChi.
Ram: 2*16gb Viper Gaming Steel 3200mhz
Graphics: Zotac 1080ti AE
Power supply: Seasonic
System has been stable since install in September 2019.
Apparently, 4d that's a "4D - OEM post memory initialization codes" issue. Further searches suggest from other's experience that there is some possibility with a CPU issue.
OCuk suggested that its either the memory controller on the CPU or the motherboard itself. Should be an easy test because it's not posting. OCuk requested that it gets boxed up with CPU in-situ. Support booked in a DPD pickup return tomorrow arriving Wednesday with OCuk.
adding to forum here in case it's useful for anyone in the future searching the 4d post code from Dr Debug's BIOS codes, and also to say thanks to OCuk for a hassle free set up of an RMA.
Will post any updates if it adds anything which could help future searches with similar issues to the above.