PC power is activated and then immediately disengages.
PC power is activated and then immediately disengages.
I began a fresh assembly, but once all parts were put together, turning on the computer causes it to fail in detecting the monitor and USB devices, then shutting off completely. Only the graphics card seems new. The components are: CPU AMD Ryzen 7 7800x3d, motherboard Asus rog strix b650e--f gaming wifi, GPU Msi RTX 3060 Ti Ventus, case Nfortec Caelum Black, power supply Tempest Gaming G750 750W, and an AIO Corsair H60X. The SSD is WD Black SN770 2TB. Could the PSU be insufficient for this build?
Best regards
CPU : AMD Ryzen 7 7800x3d
+
AIO : Corsair H60X
Your cooler is incorrect for this setup, as the radiator won't effectively cool the processor.
PSU : Tempest Gaming G750 750W
The model and details of the PSU are unclear; a picture of the labeled side would help.
You may also want to check your CPU's socket for any bent or damaged pins.
If the RTX 3060 isn't brand new, are you certain it's still suitable?
The 7800X3D includes its own integrated graphics. Take out the RTX 3060 and link your monitor directly to the motherboard's video output using the 7800X3D display.
The absence of a video connection could stem from the BIOS being configured to use the iGPU display instead of the PCIe GPU. If you're fortunate, the BIOS will detect no monitor on the designated port and then verify the presence of a PCIe GPU for a display.
If not, the BIOS may simply give up if it can't find a monitor on the first listed port.
It's not just about having enough power; evaluating an ATX PSU requires looking beyond its advertised maximum output. Consider factors like circuit design, operating temperature limits, power factor correction, efficiency, cable count, and more.
If these details feel unclear, you can often assess a PSU's reliability by its price:
A 750W unit priced at $25 is likely unreliable and could fail unexpectedly.
A decent 750W model should cost between $80 to $100.
These are general guidelines.
The Reddit post linked below suggests your Tempest Gaming GPUs 750W model is valued at around 40 Euros with a Bronze efficiency rating, and other sources indicate it's no longer in stock.
https://www.reddit.com/r/buildapc/commen..._psu_750w/
Your 750W Tempest GPUs Bronze unit doesn't meet the expected standard for pairing with a 7800X3D or RTX 3060 setup.
A better choice would be a Gold-rated model, such as the Corsair RM750, if you have the budget.
https://www.corsair.com/us/en/p/psu...ol...9020195-na