04-04-2017 01:11 AM
I have an issue with the miniDP connection. I use it for an external monitor via miniDP to HDMI connector. It was working fine until I moved my laptop last weekend. Now the laptop does not detect that it even has a DP. Only VGA output is available.
I have updated everything from the Lenovo support center and tired re-instaling video drivers. No changes so far. Any ideas?
the graphics card is Intel HD5500. Running Windows 7.
04-04-2017 07:08 AM
Do you get any errors?
have you tried other hdmi cable?
have you run Lenovo test program from bios?
first off, can you see the external display in device manager?
if yes then it's a setting.
if no then try this,
try the display in other source (other computer or something that can provide picture over hdmi)
new hdmi cable
If nothing helps, then it's mobo issue.
04-04-2017 07:33 AM
04-04-2017 08:00 AM
power everything off
connect the hdmi cable
power the monitor on first
wait 10-20 seconds
power up the T450
I've run into some hardware that need the external display on first. Why? Not sure. Strange video circuit design maybe?