GRAPHIC PROBLEM & VIDEO IS NOT WORKING SOUND & PICTURE

the following reasons are only part of it and do not represent all possibilities.
1. Damaged video files.
2. Graphics card damage.
3. Lack of proper video codec.
Maybe you can check on this:
How to Solve Windows Media Player No Picture Just Sound

If the monitor works on a different PC, the problem may be your video graphics card. If it is a builtin graphics card, you can install a graphics card and disable the integrated one if there is an open slot on the motherboard.

The Dell 520's manual can be downloaded here. The PC's motherboard optionally has a VGA Video Connector (integrated) as shown on Page 1 of the manual. If yours is equipped with this option, there is no graphics card installed - it is built into the motherboard itself. It can not be removed or separated from the PC.

Your PC may have a a separate video card installed into one of the expansion slots on the motherboard. Page 1 also shows this installed below the USB 2.0 connectors as the PCI Express graphics card.

Here's an internal view:


The video card in the picture is driving two standard analog VGA monitors (blue cable connectors) through a DVI -> VGA adapter (white and clear devices) this is connected to the video output connectors. If you look closely at the edge of the PC in the picture (directly above the USB & network cables) you should be able to see an unused VGA Video Connector (integrated). Most computer BIOS systems will automatically disable any built in video capabilities of the motherboard when a separate video card is detected. Check the manual for additional info about these BIOS settings.

I hope this helps & good luck!

I recommend you try VLC it works with almost any video, is free and works on every OS, goodluck :)

Not all HDMI provides sound, older versions of HDMI are video only. If you're using a laptop you could review the model to see if it has sound support, if it's a desktop computer or a graphics card you can again check to see if there is support for audio. If there isn't and you have a desktop computer, you could upgrade your graphics card to a newer model with HDMI audio support.

You don't have the codecs needed to watch the movie.
Download some codec pack, or just use VLC.
Link to VLC

This is what you will get right before the 1 red ring shows up on # 4. Do the X-clamp fix. Trust me it works.

Your graphics encoder chip (For HD & component mode) needs resoldering to the board. These chips get very hot, and with the xbox's poor cooling system, this fails to dissipate the heat correctly.

We repair this and give a 4 month guarantee on all work.

FixMyConsole

update your video graphics driver. this might be old. new games today is compatible with the latest software drivers. check the manufacturer of your graphics adapter. manufacturer has a suuport. download the driver update and install. that works. goodluck