My Ps3 Will Not Update ! / Start Help ?

I Just Bought A 120 Gb Ps3 The New Version From A Pawn Shop Today. and god of war 3. so i put the disk in and it said i had to update so i went to setting and system update and all that and it told me i had to connect to the internet etc so i did and went back to software update then it finished i turned it off cause it was a black screen for like 10 mins so i turned it off and i know i wasnt sposed to so i turned it back on . and it turned off the red like started blinking then i pressed the button and then it was just the regular red and i turned it back on and it turned on for like 5 secs then turned yellow for like 1 /4 of a second then turned off . then i repeated countless times. then i held the button down for two beeps then it turned of then i waited a second and turned it back on then it s your system will now update when done your system will automatically restart . so i waited then when it finished it turned to a black screen again , so i repeated this whole thing over again . i cant even get to like my playstation menu without it system updating me . I Will do Anything to make it work again whether its formatting it or something please help!