in reply to
what is for key pls
It looks to me as though that is probably the self-destruct sequence to your computer's processor. Specifically, if you have an Intel processor, as soon as that sequence appears on your monitor your CPU starts an internal counter. The process is irreversible. In 9.567e224 hours from initial sequence a crontab will execute the final instruction set, and the CPU's core will go super critical. The purpose of this instruction set is to prevent unwanted tampering by other beings.
I read in this article (near the bottom) that there has been limited success in disarming the code by disassembling your computer's power supply, and removing the crystals. Be sure to disconnect it from main-line power first. The only way to know if it worked is to wait until 9.567e223 hours pass. If that time passes without the warning flash then you're in the clear. There is no way to monitor this other than by visual verification.