A few months ago I was trying to connect my Samsung LED TV to my HP Pavilion laptop as an extended display via an HDMI connection. Though this would not work using my computer's standard Intel HD Graphics GPU, I found that by switching to the ATI Mobility Radeon, the 2 devices could connect and all was well.
(Actually, as a side note, for a long time I got no sound, only video. But then one day, for seemingly no reason, the sound started working.)
During the time they were working, my laptop automatically shut itself off to prevent overheating. Before I wised up to what was happening, it probably shut itself off a total of about 3 times. So I started elevating the laptop while connected to the TV (after all, I was only primarily using it so I could watch shows on my TV) so the side vent had lots of room to breathe, and the overheating stopped.
Then, about a month ago, the connection stopped working. The HDMI cable is fine, I have tested it. When the HDMI cable is plugged into the laptop, the TV recognizes something's there, because the "HDMI 2" Input will light up and become selectable (and I tried the TV's HDMI 1 port as well, same issue). So this led me to a computer issue.
What seems strange is that when I connect the HDMI cable to my laptop's one HDMI port while in Intel Graphics mode, the laptop recognizes the connection and asks me if I want to switch to the ATI Mobolity Radeon. So my laptop knows a connection is present. I've said yes to this automatic graphics-card-switching, as well as manually switched them first and connected the cable afterwards, but either way, the TV does not receive a signal.
The problem seems to revolve around the fact that when I open my ATI Catalyst Control Center, under Desktops & Displays, no additional display is shown, whereas in the past the TV would pop up as soon as it was connected. Detect Displays does nothing. If I try manually adding a display by going into Window Mobility Center and clicking Connect Display, a new display will appear in Desktops & Displays, but it will not identify itself as my TV.
I have no idea what happened to make my laptop unable to Detect the TV. I tried system restore to the earliest date saved (which admittedly was not that long ago), but that did not work either.
Does anyone have any ideas?