Memory or GPU errors without error codes occur when the CPU is not properly installed, pins are damaged, or thermal grease pollutes the CPU socket pin.
Applying thermal grease to CPUs
Many coolers these days, particularly all-in-one (AIO) liquid coolers, come with thermal paste already applied on the cooling plate. Intel's previous-generation mainstream CPUs had a square, more compact shape. But with the rise of the hybrid CPU architectures used in 12th and 13th Gen Intel CPUs that use the LGA1700 socket, they have a rectangular shape with more surface area. This, combined with larger, more complex layout of the components under the heat spreader, means that you'll want to apply more than a single dot in the centre of the CPU. 12th and 14th Gen Intel processors, apply one small (3-4mm) dot of paste in the centre of the CPU and four smaller dots (2mm) a couple millimetres in from each corner. Note that the typical syringe applicator and viscosity of thermal paste makes it pretty hard to be exact here. So long as you're not applying substantially larger dots here, you should be fine. It's also pretty difficult with most pastes to apply a dollop that's less than 2mm.
Follow the below thermal paste patterns:
The first thing you see once you locate the CPU socket on the motherboard is the metal arm next to the socket that's attached to the socket enclosure. For LGA 1700 and AM5 motherboards, you just need to lift this arm up enough that it frees the metal frame covering the CPU socket. For AM4 motherboards, make sure this arm is pointing directly upwards.
Inspecting CPU and CPU Sockets
If the processor is not seated properly or the socket pins are polluted with heatsink grease, the system should malfunction. (for example memory / GPU not detected /no error codes / no warnings )
please find below images for example
Re seating the CPU
Check the CPU to ensure it is properly seated in the socket or remove and reinstall. Please remove the old heatsink paste from the processor and cooler and apply a new heatsink paste before fixing.
Cleaning heatsink paste from processor socket.
Gently remove the processor from the socket, then remove the heatsink paste from the socket using an IP (Isopropyl alcohol) and antistatic brush.
Please do it very gently and cautiously; else, it will damage the socket pins.
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