It didn't work couple times last week but I was able to reinstall the drivers and then got it work again.
This morning it didn't work again when I booted up the HP laptop (Win 7 Home 64 bit).
Again, I tried to download the latest version 6.3 from the displaylink site and reinstalled it. It didn't work this time.
I removed the Display link core program and disabled the DisplayLink Manager from startup service. Then, reinstall the driver. Then, plug the USB back in. (also tried all 3 USB ports)
In Device Manager, you can see USB Display Adapters - Plugable USB VGA-165
with hardware Ids - USB\VID_17E9&PID_037B&ReV_0101
I noticed Plugable's web site suggested using 5.6M1 instead of 6.3
http://plugable.com/drivers/displaylink/usb-2-0/
Which one is right for this adapter?
The DisplayLink Manager service has also been started. And the Core software and graphics were installed as well.
I have also reconnected all the cables.
During my reinstall, reboot process, there was once the USB driver wasn't installed properly (resulting in a failure popup) But I reinstalled it again and it seemed fine.
It is just somehow, I can't extend the desktop to the new display like I used to..