I Googled And Youtubed It,, Way To Many Retarded "Try This Solutions" ....

Any Suggestions!!!!???

"AV cable error... There is a problem with the AV cable, try using a different AV cable. If the cable is known to be working then there is a 90% chance it's a scaler chip problem (the "ANA" or "HANA" chip connected directly to the AV cable) in rare cases it is the GPU."

http://www.llamma.com/xbox360/repair/Xbox-360-error-codes.htm

https://support.xbox.com/support/en/us/nxe/kb.aspx?id=907536

Did you see this suggestion?

CAUSE
A single flashing light might indicate a hardware failure on your Xbox 360 console.
Back to the top

THINGS TO TRY
Step 1: Disconnect and reconnect all cables
a. Turn off your Xbox 360 console.
b. Unplug all memory units, controllers, and accessories from your console.
c. Unplug everything from the back of your console, including power and video cables.
d. Unplug your power supply from the wall, and then unplug the short cord from the power brick.
e. Plug everything back in. Make sure that you make all connections firmly.

Step 2: Remove the hard drive
To see whether the problem involves the Xbox 360 Hard Drive, temporarily remove the hard disk unit. If your Xbox 360 console does not have a hard disk, go to step 3. To remove the Xbox 360 Hard Drive, follow these steps:
a. Turn off the console.


Step 3: Disconnect any memory units
a. Turn off your Xbox 360console.
b. Unplug any memory units attached to your console.
c. Turn on the console.
If these steps resolve the issue, reattach the memory units to verify that the error occurs only when a memory unit is connected. If this is true, contact Xbox Customer Support to order a replacement memory unit. To contact Xbox Customer Support, visit the following Web site:


Step 4: Request a repair
If the previous steps do not resolve your single flashing light issue, there are no additional troubleshooting steps and your Xbox 360 console must be repaired at our service center. Start the repair process online.

If its out of warranty to what i did, buy one of the RROD repair kits from Ebay, you'll need a T8 and T10 screwdriver, and a shell remover thing unless you do what i did and pry it off.
My 2007 xbox got an E74 and i fixed it with a £2 repair kit!