PC boots up, no video output

Desktop

Recruit
Hi, everyone. Need your suggestion/advise regarding desktop computer issue.
OS - windows 10 64bit
CPU - Intel i5 12400
CPU cooler - Deepcool AK400
Mobo - Ashrock B660 Steel Legend
RAM - Corsair lpx 3200 mhz 8GB x 2
GPU - Sapphire AMD rx6700
PSU - Corsair RM850x
OS storage - WD Blue 570 nvme 1tb, and 3 wd hdds for data.
Monitors - Dual Monitor
* 3 - chasis fans
Cabinet - CM 690 II.
PC age - 2years and 2 months.
Used approx 15hrs everyday.
Use - Mostly browsing, light work stuff, game played approx 6 months ago.

PC built in July 2022, was working fine till a week back.

Since past 2 days would sometimes Restart by itself when in sleep mode few times a day. Same happened today twice till evening.

Yesterday at around 10pm same happened but it has shut down by itself. Tried powering On - Mobo RGB lights were on - CPU cooler fan was running but none of the chasis fan ran, tried to boot but shut down after startup ashrock logo. Happened thrice.

Removed bios battery, waited 2 minutes then re-inserted battery and tried to power on PC. - CPU cooler + all 3 chasis fans running, no video output - on discrete or dedicated GPU. - At first few attempts to power on - Boot Led on Mobo was constantly ON.
Then on subsequent tries to power on through power button - CPU and RAM both leds remain constantly ON.

Remedies tried by me till now -
1- disconnecting every peripheral.
2. Removing CMOS battery many times.
3. Removed, cleaned both RAMs, tried to test with single Rams on all 4 slots.
4. Remove - reseat - repaste - CPU.
5. Connected spare PSU with Mobo and CPU connection only.
NOthing helped.

Issue - CPU + chasis all fans running + CPU and RAM leds on Mobo constantly ON. No video output on Mobo or Discrete GPU.

Please guide/ advise further course of action if and how it can be resolved.

Sorry for long post, and Thank you for all your valuable suggestions.
Regards.
 
Can be an issue with processor too. Just RMA'd a new 12400f with similar issue of no display, the moterboard should have some led indicators to show the exact issue.
Check if power led or diagnostic led is blinking and check corresponding error codes.
 
Can be an issue with processor too. Just RMA'd a new 12400f with similar issue of no display, the moterboard should have some led indicators to show the exact issue.
Check if power led or diagnostic led is blinking and check corresponding error codes.
Yes, CPU and DRAM leds are constantly ON, no display output.
How many days it took to get RMA replacement CPU from Intel ?
 
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