"Bad/missing OSB logo" this error pops out when i switch on the PC ...?

i gain this error when i try to switch on the pc.. nil will load thats the first entity i get consequently i have to restart the laptop a couple of times since it starts loading the bios and other stuff and one more item i can only switch it on on risk-free mode anyhelp??

Answer:
Start up in locked mode then goto a restore point. if reload the OS

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