I've had my Xbox 360 elite 250gb model (the MW2 promo one) connected to a Hannspree Xm-S 19" monitor* for about a year or so. I'd disconnect it and move it to other TVs the odd time, but not often. These moves went by without incident, until recently.
About two weeks ago I took the console round to my friends house, played a bit of Halo 4, brought it home. The next day I went to connect it back up to my monitor, and I got nothing from HDMI. I tried a couple of different cables, both ways round, and still nothing.
I then moved the Xbox to another TV in the house, used component cables and got it to work fine, but still couldn't get any signal from the HDMI port.
The monitor would flicker, as if it knew there was some input, and then flash up the message "no signal detected", the TV (A Panasonic 32" model) just remained blank, with both of it's HDMI ports.
Naturally, I assumed that it was broken, and since I'm beyond warranty and I know a guy, I took it to get fixed. However, when the repair guy tried to replicate the problem, he couldn't; the HDMI worked perfectly fine with any TV or Monitor he connected it to.
After we stared puzzled for a while, I took it home with me again, significantly more confused.
After trying literally everything I can think of, I'm still stumped.
I've been trawling through anything i can find on the Internet for the past week or so, trying anything that is suggested, in the hope that it would work, but still nothing.
Here's what's been tried, to the best of my memory:
-All cables used work fine with other HDMI devices in the Monitor and TV
-TV and Monitor's HDMI ports work fine
-Xbox outputs HDMI, just not in my house
-Display settings have been tried and tested; I get no signal on any setting available to me, either with the Monitor TV of Xbox
-I have no option to disable 'Display Discovery'
-I've tried the Y+Rtrigger reset thing, and got nothing. (apparently that only works for component or composite)
-I have changed the display settings of the TV and monitor, still nothing
-I'm not buying an HDMI switcher. Firstly, I'm a student and that costs money. Secondly, it's caused this issue for others, not fixed it.
-Component outputs just fine, but I'd need HDMI for my monitor
I'm kinda at my wits end here, and I've heard the phrase 'Have you tried turning it off and on again' more times than any man ever should.
I've tried everything I've encountered on these forums, and I've listed as much as i can remember above, so please don't give me those things for answers!
But on the other hand, any help here would be greatly appreciated!!
I'm sure the issue is with my Xbox, as it worked fine with the monitor and TV before, but now refuses to.
(Honestly, I've been itching to get stuck into the next episodes of Spartan Ops and the wait is killing me!!)
*note: Monitor only has VGA and HDMI inputs for video, HDMI is set to 720p 60HZ (98% sure of this)
other note: this Xbox is definitely well past warranty, and was 2nd hand when i bought it (again, student!) so sending it to Microsoft isn't a feasible option.