Xbox wont turn on after unplugging power cord while Xbox light was flashing

So I downloaded the new update for preview members, and have been experiencing slight problems. Today it was freezing up on my little brother and tried to turn it off using his controller, tried turning it off, that didn't work either. So he turned off the
xbox by pushing the power button and the screen changed so he thought it worked. Apparently it the power light was still flashing grey and white for 5 minutes before he decided to unplug the power cord from the Xbox. Now we can turn it on but the screen says
no signal as if it can't connect even though my hdmi cable is intact and securely in place. Please Help!

:)

 

One of the four lights surrounding your Xbox 360 power button flashes red - solutions

If one of the four lights surrounding your Xbox 360 power button flashes red, you might receive following error code:

E74
E66
E68
E69
E70

Or you might not see any picture on the screen.

If you see the error code E74, your console needs to be repaired.

But if you see the other codes mentioned above or no picture on the screen, follow the steps bellow to troubleshoot the problem:

Step 1

Disconnect and reconnect your power supply cords

You may see one flashing red light after turning on your Xbox 360 console if the power supply cords are not plugged in properly. So, you need to reset your power supply.

Here is how:

• First you need to turn off your console.
• You’ve to disconnect the power cord from the back of your console. You also have to unplug the power cord from the wall outlet and the power supply unit.
• Now you need to reconnect all three connections. You must ensure that the connections are secured.
• Finally, turn your console back on.

If the problem exists, follow the next step:

Step 2

Remove your hard drive

Hard drive failure might be the reason of one flashing red light. To check if this is true, remove your hard drive temporarily.

See: How to remove and reattach Xbox 360 hard drive

Note: Not all Xbox 360 consoles include a hard drive.

After removing the hard drive, turn your console back on. If there is no flashing light, there is a problem with your hard drive. But if the light still flashes red reattach the hard drive and follow the next step.

Step 3

Remove memory units and USB flash drives

Faulty memory unit or USB flash drive might causes the error. If you’re using a memory unit or USB flash drive, you need to remove it.

To remove your memory units or USB flash drives, you need to turn off the console. After removing the memory units or USB flash drives, turn your console back on.

If this solution worked, you’ll not see the error message and the light no more flashes red.
But if the problem still exists, follow the next step.

Step 4

Disconnect accessories

One light might flashes red because of a defective accessory connected to your console. So you need to disconnect any accessory connected to your console to see if it is true.

Here is how:

• First, you need to turn off your Xbox 360 console.
• Now, disconnect any accessories, such as controller or the Wireless Networking Adapter.
  
  Note: The A/V cables and the power supply must be plugged into your console.
• Finally, turn your console back on.

After performing all above, if you cannot troubleshoot the problem, your console needs to be repaired.

 

xbox 360 power brick green light on when not connected to xbox

my xbox 360 S Slim power brick light is green when i plug in the power cord even when the power brick cord is not attached to the xbox

and when i try & turn the xbox on the power light comes on then off & the xbox wont turn on at all

 

Hey matey,

Please direct any questions relating to the preview program, through to the preview program support forums, which I've linked for you below That way you can get help from the support team who know the program best

forums.xbox.com/.../default.aspx

If you can't access that forum, please let us know and a support team member will be able to provide you with access

Cheers

Denaz