u/Jizzivitus

PC decided it no longer wants to POST with original RAM

Computer in question: Lenovo Legion T5 26ARA8 Desktop, Ryzen 7700, SKHynix 32GB 5600MHz DDR5 RAM (2x16GB Sticks), 4070, Thermaltake Tough power GT 850w Gold PSU (Brand New), Samsung 980 Pro 1TB NVme

Computer will turn on light up but will not show display or detect keyboard/mouse. Thought it was the PSU as that was on its way out so I replaced that but am still with this issue.

Came to realizing it is RAM issues as I took my Teamgroup 6000MHz DDR5 (2x16GB) sticks out of my other PC and put them in the Lenovo and it posted after it retrained. When finding that out I then took the 5600MHz SKHynix and put them in my other PC and it posted (after changing RAM speed profile in BIOS)

Other PC: Ryzen 9800x3D, MSI x870e Carbon Wifi, Teamgroup 32GB 6000MHz DDR5 RAM (2x16GB), Gigabyte 5080, ASUS ROG 1000w Platinum PSU

Things that have been done:

-Clear/Jumper CMOS(Multiple times)

-Tested singular RAM (both sticks) in each slot

-Power cycled each attempt

-Reflashed BIOS update. (No older versions available)

-Left computer to retrain for 30-60mins on each memory slot with each RAM stick

Lenovo BIOS are very limited in which you can do within. RAM speeds have single setting with no changes. EXPO/XMP profiles do not exist or if they do are blocked from accessing. Feels as there may be something software related in which is keeping it from retraining or detecting original RAM

My head is unable to figure this out.

Old PC decided to no longer boot after vacation. It is a Lenovo Legion Desktop 26ara8. I knew the PSU was going so replaced it with a 850w from the 500w it came with. Unfortunately still will not Boot. Tried resetting CMOS, power discharge and trying different RAM (DDR5 5600mhz which came with Lenovo) slot variants (with both RAM sticks and singular) with no success.

I had installed one of my 6000mhz DDR5 from my new computer and it booted right away. Which I then came to the conclusion that the ram was faulty. I then tested the old ram in my new computer and the new computer booted with the old RAM. Which then confused me. I tried reinstalling the original ram back into the original computer and still would not Boot.

Every post online people are having the opposite issue and new installed RAM are having boot issues and OG RAM is booting properly. In my case OG RAM is not booting and new installed RAM is working...

Please help me wrap my head around this