I've also had this problem in the past week running Fedora 35. The issue appears to be a bug in certain versions of the Linux kernel (described in more detail here: [URL] which prevents certain hardware from being able to wake from a sleep state. I was able to resolve the issue by disconnecting and then reconnecting the battery (to fully power off the laptop and get it out of the sleep state), after which I was able to turn the laptop on again using the power button as normal. Then, once I was onto my system, I downgraded the kernel to a stable version (in my case 5.16.19, down from 5.16.20) to ensure that it doesn't recur. 
I just bought  a new Dell Inspiron 5515 ryzen 5 laptop and I was installing the cern root software which usually takes two hours to complete the installation process. So while the installation process was going on I left the laptop idle and was doing other work. after one hour when I come back and press the power button of the laptop it did not turn on. Then I tried several times to turn on the laptop but nothing worked.   Kindly help me! It is a brand new laptop. 
dell isnpiron 5515 does not turn on