Vizio VU42L HDMI problem

[vveksuvarna]

i ll try to explain this to my best capacity,

both hdmi inputs detect 1080p signal, but do not display anything,

the screen flashes between black and the 'no signal' blue screen every 2 seconds, but besides that, there is no video or audio whatsoever,

i tested this with my sony bdp-s300, ps3, and comcast hd reciever, and when i tested these devices with either component or av cables, it worked fine,

i have 2 different hdmi cables, and i did a switcheroo on all 3 devices, and on different inputs, and there was no difference in its behavior,

unfortunately the vizio is out of warranty, and i am trying to get this to work,

any and all help is very appreciated,