The new setup requires that both the motherboard and CPU be connected to the power source.
The new setup requires that both the motherboard and CPU be connected to the power source.
Hello All,
I'm a veteran builder but this problem has me completely stumped. This is a ground-up, new build, my components list is below. After assembling the PC, there was no POST, no fans no clicks, the only sign of life was the CMOS, and SMART buttons were lit on the back of the MB. I went through the usual steps of removing components one at a time until finally I only had the motherboard and CPU, but still nothing was working. I removed the MB and tried it on the bench, jumping the power pins, but no luck. The PSU is brand new but I swapped it out with an older one I knew was working, no change. I assumed the MB was dead and RMA'd it with MSI who tested and returned it as fine. I replaced the PSU with a new one. I plugged the MB and CPU into the new PSU and again the CMOS and Smart buttons lit but nothing happened. I unplugged the CPU cables and wonder of wonders the motherboard went through POST far enough to recognize there was no CPU and then stopped. I then shut it down and plugged in the CPU cables and it again went through POST. My CPU cooler was not plugged in so after a moment the CPU began to get hot and I shut it down. I then plugged in the pump and again the system went through POST and stopped at no storage device. I plugged in the drives to the PSU and nothing happened. Only the CMOS and Smart buttons are lit, nothing else happens. Resetting the CMOS and tried again, but nothing happened. From that point on, nothing I do changes anything. If I leave only the MB, CPU, and pump plugged into the PSU it will boot to BIOS. If I add anything else at all to the PSU, nothing happens. I have tried three different PSU's all of them are of more than enough wattage for this system, all of them are listed as compatible with this MB by MSI the issue is the same. I have tried the MB on the bench and in the case properly screwed into the standoffs and that doesn't have an effect. My house is old so I thought maybe resistance in the outlet wires was causing a voltage drop, so I tried different outlets but had the same result. I also tried isolating the system from the outlets by plugging it into a UPS with a battery back up and the issue persists. Any help or ideas you can give me would be much appreciated!!
Here are my system components:
MSI z790 Carbon WiFi
Intel i9 13900K
Corsair Dominator DDR5 6600 MHz
GE Force RTX 3090 (installed on MB but not plugged in to PSU)
Hyper M.2x16 Card with 4x2TB M.2 drives
Corsair H150i cooler
6 case fans plugged into Corsair controller
Inwin Case
Corsair HX1500i and Thermaltake 1200W power supplies
Using series 4 power cables.
Corsair HX1500i and Thermaltake 1200W power supplies
The two PSUs come from different manufacturers, so use the cables that came with each unit separately.
Thermaltake 1200W
This is the brand name for the device. Could you confirm the exact model number?
GE Force RTX 3090 (installed on motherboard but not connected to a PSU)
Without the dedicated GPU, the display should still work through the integrated graphics on the K suffix chip. But why isn’t it being powered via the PSU while it was being installed in a PCIe slot?
Corsair Dominator DDR5 6600 MHz
The details are unclear. How many RAM modules are you using? If two, they should be placed in slots A2 and B2.
Corsair H150i cooler
Try easing pressure on the CPU socket, adding a cooling mount or block, and observe if it improves performance.
Breadboard the setup and check if the system boots with the display connected.
It might help to add some spacing in your text layout for better readability.
Hey, thanks for the tip. I was actually figuring it out on my own. The SATA power cable I had was not from Corsair, which is pretty important. I replaced it with one from the Corsair bag and the issue disappeared.