F5F Stay Refreshed Hardware Desktop My PC won't turn on, but both the RAM lights and the CPU lights show up. What should I do?

My PC won't turn on, but both the RAM lights and the CPU lights show up. What should I do?

My PC won't turn on, but both the RAM lights and the CPU lights show up. What should I do?

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XxPeefacexX
Junior Member
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03-25-2026, 04:58 PM
#1
I am fixing a computer for my friend using these parts: Motherboard is an Asrock B850M PRO RS with WiFi. The CPU is a Ryzen 9700X (this fits on the board). The graphics card is a Zotac RTX 5070 TI. There are two sticks of RAM at 32GB each running at 6400MHz that fit in the right slots. I got a power supply from MSI with 850W capacity. When I hit power, there is no picture on the screen but both the CPU and DRAM lights are glowing red or yellow. The fans for everything are spinning, including the A RGB lights and the RAM sticks which are lit up too. I checked the manual and put sticks in the right slots going from A to B, but nothing happens. I tried updating the BIOS using a flash feature and it worked fine until the blinking stopped. Even after that, the CPU and DRAM lights stay on. I also moved the RAM around and only put one stick in each slot, but still no picture shows up.
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XxPeefacexX
03-25-2026, 04:58 PM #1

I am fixing a computer for my friend using these parts: Motherboard is an Asrock B850M PRO RS with WiFi. The CPU is a Ryzen 9700X (this fits on the board). The graphics card is a Zotac RTX 5070 TI. There are two sticks of RAM at 32GB each running at 6400MHz that fit in the right slots. I got a power supply from MSI with 850W capacity. When I hit power, there is no picture on the screen but both the CPU and DRAM lights are glowing red or yellow. The fans for everything are spinning, including the A RGB lights and the RAM sticks which are lit up too. I checked the manual and put sticks in the right slots going from A to B, but nothing happens. I tried updating the BIOS using a flash feature and it worked fine until the blinking stopped. Even after that, the CPU and DRAM lights stay on. I also moved the RAM around and only put one stick in each slot, but still no picture shows up.

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Kringleriffic
Junior Member
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03-25-2026, 05:56 PM
#2
Did you use only the cables that came with the new PSU? About your video connection? What kind of monitor do you have? Will it boot into Safe Mode right away? Read and reread the Motherboard's User Guide or Manual along with all other component docs. Pay close attention to every small detail and warning. Details really matter. Hopefully there is just a missing piece or a mistake made = = = = Double-check by looking at it and feeling it that every connection, card, RAM stick, jumper, and case plug are all fully and firmly in place. No one wants to force things especially with a brand new build. So something sitting there looks right but isn't actually secure. Power down completely, unplug everything, open the case. Carefully disconnect, reconnect or wiggle it out a few times until it feels solid. Leave the CPU alone. You might find that some plug suddenly clicks in much smoother and tighter than before. And check the MB User Guide/Manual. Some motherboards require the first RAM stick you put in to go into a specific slot like DIMM_A2.
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K
Kringleriffic
03-25-2026, 05:56 PM #2

Did you use only the cables that came with the new PSU? About your video connection? What kind of monitor do you have? Will it boot into Safe Mode right away? Read and reread the Motherboard's User Guide or Manual along with all other component docs. Pay close attention to every small detail and warning. Details really matter. Hopefully there is just a missing piece or a mistake made = = = = Double-check by looking at it and feeling it that every connection, card, RAM stick, jumper, and case plug are all fully and firmly in place. No one wants to force things especially with a brand new build. So something sitting there looks right but isn't actually secure. Power down completely, unplug everything, open the case. Carefully disconnect, reconnect or wiggle it out a few times until it feels solid. Leave the CPU alone. You might find that some plug suddenly clicks in much smoother and tighter than before. And check the MB User Guide/Manual. Some motherboards require the first RAM stick you put in to go into a specific slot like DIMM_A2.

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