Message displaying "No Singal"

How do i do that? It shows picture/movie on the screen but says no USB disk

You should be able to buy an external USB drive (or thumb drive) at any electronics store.
You can connect a USB hard disk drive or USB
memory stick to your TV by using the USB inputs of
the TV. This feature allows you to play files stored in
a USB drive. 2.5" and 3.5" inch (hdd with external
power supply) external hard disk drives are supported.
IMPORTANT! You should back up your files before
making any connections to the TV set in order to
avoid any possible data loss. Manufacturer will not
be responsible for any file damage or data loss. It is
possible that certain types of USB devices (e.g. MP3
Players) or USB hard disk drives/memory sticks may
not be compatible with this TV.
Quickly plugging and unplugging USB devices, is a
very hazardous operation. Do not repeatedly quickly
plug and unplug the drive. This may cause physical
damage to the USB player and USB device itself. Do
not pull out USB module while playing a file.
Media Browser Menu
You can play photo, music, and movie files stored
on a USB disk by connecting it to your TV and using
the Media Browser screen. To do this, perform the
following: Connect a USB disk to one of the USB
inputs located on the side of the TV.
You can connect two USB devices to your TV. If both
USB devices include music, picture or video files, USB
selection OSD will be displayed on the screen. The
first USB device connected to the TV will be named
as USB Drive1. Select a device by using up or down arrows
and press OK

Nope, you certainly can't. The TV can only show still photos or play music. It's not capable of playing videos.

The manual is here:
http://www.samsung.com/ae/support/model/LA40D503F7RXZN
or
2011 LA40D503F7R 40 Inch Full HD LCD TV LA40D503F7RXZN Support SAMSUNG Gulf
See pages 16 and 17.

Burn your movies to DVD or Blu-Ray and you can plug a player into the TV, also described in the manual.

It is likely that the movie is recorded at a low resolution for display on a mobile device rather than a large TV. If you have ever watched an upscaled low res movie, you would probably want to obtain a higher resolution version instead.

Some TV models have a USB port so that users could play videos and movies from USB on TV. You can try the following steps:

1. Connect your readable and writable USB drive to computer
2. Copy your movies to USB drive and then disconnect your USB drive from computer.
3. Connect the USB device to the Sony TV USB port. Turn on the connected USB device if necessary.
4. Press the HOME button on Sony remote controller to open the menu.
5. Enter the target USD drive.
6. Select the file you want to play back, and then press the play button to start playing movies on TV via USB drive.
It's quite easy to play movies from USB on smart TV devices.

Hi,
Based on the user manual for your TV, I don't believe you can play media from a USB device on your 39in model.
The USB port on the TV is used for the 'Time Shift' feature on your TV (which allows you to pause, play and rewind broadcast TV).
I do not believe your TV can play digital media without a device providing video output.
Hope that helps. http://www.sansuiproducts.com/images/manuals/SLED3900.pdf

maybe you did not properly select the right application in your tv... example if you play movies go to movies menu and if thats music go to music menu and also for pictures go to picture menu......or the format of you data is not supported of you TV..

check to make sure what format your usb is and see if you set reads it like fat 32 etc.

I would recommend you s-video. I also have an Acer Aspire and s-video is working perfectly. you have to change the second monitor's resolution on your PC to the display and frequency of the TV. The most common configuration is 800x600 display with a 60mhtz refresh rate (frequency), and send the image through the additional monitor (your TV).