freeze monitor on the 360 slant top

[tx73]

hi everyone;
 i have the wms 360 slant top machine Wild Steak) . it got freeze while i am playing.  i couldn't do anything with. then i turned the power off and then on again, but this time  i just heard some sounds and nothing showing up in the monitor. i tried to put the ram clear to reset but i didn't hear the "bong" sound and nothing happens. it but i still the same. could anyone knows how to fix it or what kinds of problem is this? thank you in advance.