I have a toshiba portege R500 it switches on but after the toshiba page it goes black it needs a password that I forget

[gracely1]

I have a toshiba portege R500 it switches on but after the toshiba page it goes black it needs a password that I forget.So I cant get to the bios its only hangs on a black screen where it needs a password so I dont know the password and I dont know how to get into the bios
Please help

 

[bignastyid]

http/www.tomshardware.com/forum/id-2317968/read-passwords-lock-codes-pin-numbers.html