Here's my pc specIt's ok your English is fine and I understand your question.
It looks like it is performing a self-test cycle for some reason.
You said it works fine once it does boot up so it can't be too serious.
Need to ask you some things -
Please list your full PC specs firstly so that everyone can help you.
Have you changed any settings in the BIOS?
Does your motherboard have a speaker and make any beeps during this cycle?
Have you overclocked the CPU or GPU?
Has it just started doing this recently?
Can you test the RAM by running Memory Diagnostic.
Type 'memory' into the search bar next to the Start button in Windows to use this feature.
Andy