Pc wont post.

[Shrimparoni]

Hey everyone, my PC fans spin up and lights are on, but no POST—no BIOS screen, no beeps, just black screen on monitor (tested monitor/GPU on another rig, they're fine). Here's what I've tried:

• Reseated RAM (tried one stick at a time in different slots).

• Checked all power cables (24-pin, CPU 8-pin, GPU power).

• Removed all drives, USBs, and peripherals

• Cleared Cmos

• Tried Flashing bios but it failed

Specs: 

PCPartPicker Part List

CPU: AMD Ryzen 5 9600X 3.9 GHz 6-Core Processor  ($189.00 @ Amazon) 
CPU Cooler: Thermalright Peerless Assassin 140 77.8 CFM CPU Cooler  ($42.39 @ Amazon) 
Motherboard: MSI B850 GAMING PLUS WIFI6E ATX AM5 Motherboard  ($179.99 @ Best Buy) 
Memory: Crucial Pro Overclocking 32 GB (2 x 16 GB) DDR5-6000 CL36 Memory  ($367.99 @ Amazon) 
Storage: Western Digital WD Blue SN5000 2 TB M.2-2280 PCIe 4.0 X4 NVME Solid State Drive  ($294.99 @ Amazon) 
Video Card: PowerColor Reaper Radeon RX 9070 XT 16 GB Video Card  ($773.99 @ Amazon) 
Case: Montech AIR 903 MAX ATX Mid Tower Case  ($75.97 @ Newegg) 
Power Supply: Montech CENTURY II 850 W 80+ Gold Certified Fully Modular ATX Power Supply  ($89.90 @ Amazon) 
Total: $2014.22
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2026-03-07 12:47 EST-0500

Motherboard debug LEDs show Dram and cpu light

What else could it be? Faulty mobo? Bad PSU? Need RMA advice. Pics attached if needed.

 

I have to say this has been a miserable experience and im tempted to put a hole in my head. 

[SimplyGone]

How long are you leaving it on once you hit the power button.  Ryzen 7000 and 9000 are NOTORIOUS for long memory training times.  just turn it on and wait.  My 7000 series can take about 4 minutes some boots

[Shrimparoni]

1 minute ago, SimplyGone said:

How long are you leaving it on once you hit the power button.  Ryzen 7000 and 9000 are NOTORIOUS for long memory training times.  just turn it on and wait.  My 7000 series can take about 4 minutes some boots

That could actually be it im such a idiot, I wont find out till tomorrow as ive packed away all pc parts to take to a repair store.

[Shrimparoni]

Also as a last resort i reset bios it flashed for a bit then the light went solid so i unplugged the pc and took out the flash drive so potentially may have to buy a mobo anyway.

[Mina G]

42 minutes ago, Shrimparoni said:

Also as a last resort i reset bios it flashed for a bit then the light went solid so i unplugged the pc and took out the flash drive so potentially may have to buy a mobo anyway.

i suggest you try again it's important to stick to the instruction 

Updating BIOS with Flash BIOS Button
1. Download the latest BIOS file from the MSI website that matches your
motherboard model.
2. Rename the BIOS file to MSI.ROM, and save it to the root directory of a USB flash
device.
3. Connect the power supply to CPU_PWR1 and ATX_PWR1. (You don’t need to
install the CPU and memory.)
4. Plug the USB flash device with the MSI.ROM file into the Flash BIOS Port on the
rear I/O panel.
5. Press the Flash BIOS Button to start flashing the BIOS. The LED will start flashing
to indicate the process has begun.
The LED will turn off when the process is complete

 

if it failed go to any repair shop  they will pregame the bios for you it is completely fixable don't through it away 

[Shrimparoni]

9 minutes ago, Mina G said:

i suggest you try again it's important to stick to the instruction 

Updating BIOS with Flash BIOS Button
1. Download the latest BIOS file from the MSI website that matches your
motherboard model.
2. Rename the BIOS file to MSI.ROM, and save it to the root directory of a USB flash
device.
3. Connect the power supply to CPU_PWR1 and ATX_PWR1. (You don’t need to
install the CPU and memory.)
4. Plug the USB flash device with the MSI.ROM file into the Flash BIOS Port on the
rear I/O panel.
5. Press the Flash BIOS Button to start flashing the BIOS. The LED will start flashing
to indicate the process has begun.
The LED will turn off when the process is complete

 

if it failed go to any repair shop  they will pregame the bios for you it is completely fixable don't through it away 

I turned off the power mid bios then. I am definitely one of the people too stupid to build a pc

[Mina G]

3 minutes ago, Shrimparoni said:

I turned off the power mid bios then

it's fixable don't worry just try one more time using the instruction

if it didn't work they have tools at repair shops that can program the bios chip

it can  write to it directly 

[Shrimparoni]

3 minutes ago, Mina G said:

it's fixable don't worry just try one more time using the instruction

if it didn't work they have tools at repair shops that can program the bios chip

it can  write to it directly 

Ok thank you i was worried id doomed the thing

[Mina G]

17 minutes ago, Shrimparoni said:

I am definitely one of the people too stupid to build a pc

don't be harsh on yourself that's how we learn and even so it happens to experts too  we are human 

 

 

11 minutes ago, Shrimparoni said:

Ok thank you i was worried id doomed the thing

you're welcome 

 

i want to add if it's in warranty try to call the company and see if they can fix for you it never harm to try 

[Shrimparoni]

Update: Im taking it to a pc repair store so they can hopefully figure out whats gone wrong