Wont work red got power, I had the 74 before, and is allmost the same cables

try un pluggin ur av cable and power lead now just recconnect it still RED - try overheating ur xbox or TYPE this in YOUTUBE SEARCH - FIX E74 xbox360 .... i bet theres a tutorial on how to fix that particular problem

Try unplugging every single cable, even unplug the power supplies two cables. Wait about five minutes and then plug everything back in and turn it back on. If it doesn't work then, you might need to replace it.

E74 is an error related to video. It's either:

• Bad video cable
• Bad graphic chipset issue

Try a different video cable, unplug and plug it back in to make sure the video cable is seated properly. If it's neither of these issues, the only thing to do is to contact Microsoft's customer service and get it replaced/fixed.

sounds like the red ring of death, contact xbox as they give u a 3 year warranty on this, they will pick it up and return it fixed.

E74: 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.

The cause of E-74 with one red light Error might be overheating of your console and for avoiding such error in future you need to put your machine at an open space. Ensure that it is placed near the window or you can also make some external arrangement for cooling of console such as cooling the machine through a pedestal fan.
But as your Xbox already have E74 with one red light Problem which can be solved by only repairing it, no other alternative.
Either you can send your Xbox to Microsoft (Please note that microsoft is no longer providing extended warranty for E74 with one red lightError) and wait for 3-4 weeks. If you don't want to wait for a month, you can also fix E74 with one red light problem with the help of this DIY Video, the guide will explain step by step approach to fix the problem. Choice is yours.

E74: 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.

to fix the E 74 problem, i sudgest going to http://llamma.com/xbox360/repair/ring_of_light_x-clamp_fix.htm. they have a step by step solution for both the red rings of death(3, and 1) or the E 74 error. i sudgest buying the kit they sudgest, its $29.99 or so. then just follow the step by step instructions when your kit gets to your house

There is high chance it's a scaler chip problem (the "ANA" or "HANA" chip near the AV cable connection) it can also be caused by a faulty AV cable so check that first. In some cases it is a problem with the GPU and may be repairable by doing the x-clamp replacement. Also try this take the AV cable, plug it out and plug it in, if it still doesn't work unplug it, wipe the metal part with a soft cloth then plug it in. That might help.

error code 74 is
74: AV cable Error - There is a problem with the AV cable, try using a different AV cable.

hope this solves your problem
Maxicube