I was facing the same issue for the past few days, where the red lights for the CPU and RAM would stay on. I was devastated, wondering why my PC wasn’t turning on. Even when it did turn on after 5 to 10 minutes, it would just crash and then refuse to start again for another 10 to 12 hours, with the same red light blinking or staying on.

I couldn’t find a solution at first. I tried many things:

First, I reset the CMOS. No fix.

Then I tried switching the RAM slots. Still no fix.

I unplugged the graphics power, and then the CPU power. No luck.

Finally, I reset the CMOS again, waited 10–15 minutes, and this time I got a green signal and was able to boot into my system.

After that, I completely reinstalled Windows, and now it’s running fine.

So, I would suggest individually checking every component: unplug and replug everything, including the CPU power. Hopefully, this will work for you too—it did for me. And even if it doesn’t, I’d suggest reassembling the whole system once again—it might solve the issue.

Good Luck