[SOLVED] Turn on, turn off and then turn on again

Sep 6, 2020
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Hi sorry for my inperfect english.
The problem that i face doesn't cause any troubles or I just dont see them and I am just curius why it happen. The situation occurs only and always after I unplug my pc from the electricity. Then when i start it for the first time it wake up for like 5 sec (the fans start to work etc. but there is no bios screen) then it turn off and after next sec it turn on again and work perfectly.
Should I be worried and is there a way to "fix it" or disable something in bios? or sohuld it be this way becouse it check something and its good?

MOBO: ASUS TUF Gaming Z390+
CPU: INTEL I7-8700
 
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Solution
It does that because it is re-training the memory. You can stop it from doing it by going into the BIOS and finding the "memory fast boot" setting, not to be confused with the boot sequence "fast boot" setting. In the advanced memory settings section, usually in the same area where you set the memory timings or enable XMP, but in some cases one step deeper in the sub menus, there should be a setting to change the "memory boot type" from either normal, fast boot or Auto. Set it to fast boot so that it does not try to train the memory every time it boots, and then save settings and exit the BIOS.

Also, if you don't already have the XMP profile enabled, enable it, then save settings and restart to make sure there are no issues, and THEN...
It does that because it is re-training the memory. You can stop it from doing it by going into the BIOS and finding the "memory fast boot" setting, not to be confused with the boot sequence "fast boot" setting. In the advanced memory settings section, usually in the same area where you set the memory timings or enable XMP, but in some cases one step deeper in the sub menus, there should be a setting to change the "memory boot type" from either normal, fast boot or Auto. Set it to fast boot so that it does not try to train the memory every time it boots, and then save settings and exit the BIOS.

Also, if you don't already have the XMP profile enabled, enable it, then save settings and restart to make sure there are no issues, and THEN go back in and change the memory fast boot setting.
 
Solution
Furthermore, it's a GOOD idea to enable the memory fast boot setting, because otherwise the system is going to reevaluate the memory configuration including the primary, secondary and tertiary timings every time you boot the machine, and start from scratch anytime there is a complete power loss, most probably. It may not settle on the same settings every time, so enabling XMP and then enabling the fast boot setting for the memory configuration is a good idea, both because it will increase boot times and because it will stop any unnecessary reconfiguration of the memory settings.