Jb systam on krti hu to f1 f2 ka option deta hai or upar voltige low likha ata hai f1 pres krne se seytam on hojata hai but black screen ajati hai wlcome sreen ki jaga then phr systam of kr k on krti hu to tkh on jojata hai but f1 phr b pres krna parhta hai. ye kya pblam hai plz btyn