06-15-2010 04:37 AM
Approximately week or more ago my external VGA port stopped working - Catalyst control center detects new monitor attached, but there is no output signal (at least monitor says so). Monitor itself & cable is tested and works fine.
It seems that either it is hardware defect or recent windows update caused it. I am not sure how to test it. (Radeon drivers are dated back in 2009)
Thinkpad T60 (2007-66G)
WinXP Pro 32bit
ATI Radeon Mobility X1400
06-15-2010 07:51 AM
how about a downgrade of the bios?
Also, try to switch to vga + internal in your bios under display. Boot the laptop with the internal LCD closed, does anything come up on the external LCD?
08-20-2013 07:55 AM - edited 08-20-2013 07:56 AM
To raise the old topic...
I have exactly the same problem with my 8744-HCG model (T60 widescreen with ATI Radeon x1400). It seems to be a hardware fault (is not operating system or BIOS version dependent). I was however able to go around it by buying an "Advanced mini dock" docking station and using the DVI port. From DVI, the external display works fine. Therefore, my guess is that the video card has lost its capability to power up the analog VGA signal for the external port due to faulty in the circuits.