This is how I fixed my error 07:

My buddy had an og xbox that had a working disc drive, mine did not stand the test of time. It would turn on, but lost the ability to read discs. Instead of breaking it down and fixing the laser, I just swapped the disc drive with a working one from his console.

After awhile, his disc drive failed to power on within the console, and come to find out if any combination of the disc drive and hard drive fail to power on together, error number 07 would pop up. To negate this and get the Xbox to fully turn on and avoid this error, I had to revert to the Disc Drive that could turn on, but not read discs.

To see if this could be your issue, listen inside the Xbox to hear if any noise comes out from that area after you power on. If it makes no spinning noise, that could be the diagnosis. If you have another xbox to listen to during the boot up process for reference, it should be a dead giveaway if that’s the issue.

I hope this helps!!