hi,guys..well i m new to this community as well as with hardware stuff too..i have hp dv7-1245dx n all sudden screen went black so i googled it n find some video about heating video card..so took it apart n did tht..after tht it worked fine for about couple of hours and then it went black again..now this time when i press power button no led lights come on..fan dont spin either..no beeps nothing..power lights come on for like 2-3 secs..n ths about it..it dont do nothing...does this mean i fried my mobo??