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I know this should not a be a issue to begin with.
at idle and cool
if its under a load and does not turn on then there are problems
newer cpus will throttle and work even without a cooler or fan
Thank you both!
Yes.
restoring the last session on startup again
restart does a clean boot
You say a cold boot always starts the fan, but a restart sometimes doesn't. Does this mean the fan is already off when restarting, or does it go from on to off during the restart? Does the fan start up later if the CPU gets warm, or is it "stuck off" once it's off?
If it's NOT stuck off, this isn't necessarily concerning behavior.
I may be wrong on some nuances here, but...
RAM is volatile storage, so it just needs to lose power to be "cleared" per se. Both shutdown and hibernate should theoretically "clear" the RAM all the same as both actually turn the PC off proper, so they will both need to populate RAM again upon next load. The difference is, with the default Windows 8/10 shut down behavior, it's still closing all your programs, but otherwise basically saving a snapshot of the Windows kernel to be read from upon next boot. This is similar to hibernate (but hibernate proper will not close your open programs and will retain your current workflow, but it will need much more disk space and take longer).
Sleep mode, by contrast, "suspends" the PC; that is, RAM, and pretty much only RAM, is kept fully powered while in sleep mode and everything else stops (that is, CPU clock generator turns off, so no "processing" is occurring, and everything else, or at least almost everything, including fans should turn off [though it really depends on what S states are supported and enabled]). This is why sleep mode is generally so much faster than anything else while also retaining your exact moment of closure; nothing has to be written to, and read from, disk to RAM as RAM just retains it's current contents and presents it upon awaking, whereas both Windows 10 default "shutdown" behavior (hibernate) and restart do have to read SOMETHING from disk to populate the empty RAM. The drawback of sleep mode is using more power (but it's very minimal) and needing to keep power supplied (so, no good for laptops or if going to be unplugging the PC).