Xbox Failing Start-up Check On Boot

It sounds like there's a problem with the internal power supply built into the console. If it fails to boot it's probably not POSTing right which could be the reason why it seems like it starts up but doesn't fully turn on.

if that dont work try this: Reset XBOX 360 Failed System Updates

With the console off, press and hold the sync up button.

While holding the sync button press the power button to turn on the console

Continue to hold the sync button until the Console has booted up completely.

During the boot process the console should clear any failed updates, allowing you to use it normally.

ok try this:

Reset XBOX 360 Failed System Updates

With the console off, press and hold the sync up button.

While holding the sync button press the power button to turn on the console

Continue to hold the sync button until the Console has booted up completely.

During the boot process the console should clear any failed updates, allowing you to use it normally.

hope this works

try this:

Reset XBOX 360 Failed System Updates

With the console off, press and hold the sync up button.

While holding the sync button press the power button to turn on the console

Continue to hold the sync button until the Console has booted up completely.

During the boot process the console should clear any failed updates, allowing you to use it normally.

hope that helps

sounds like the internal hdd is giving up the ghost, i would put it down to mechanical failure as hdd's can either last 30 years or 1 year. when they start to fail you will get freezing, boot issues etc.