Today, a colleague tell me that report service can't be started on two sql servers. This is DB mirroring  environment for prodcut team. The same message be presented when i try to start the service ,that EVENT ID 1053:the service did not respond to the start or control requset in timely fashion.

      solution from google searching:

1.Click Start
, click Run, type regedit, and then click OK.
2.Locate and then click the following registry subkey:
3.In the right pane, locate the ServicesPipeTimeout entry.
Note If the ServicesPipeTimeout entry does not exist, you must create it. To do this, follow these steps: 4.Right-click ServicesPipeTimeout, and then click Modify.
5.Click Decimal, type 60000, and then click OK.This value represents the time in milliseconds before a service times out.
6.Restart the computer.
    modified the registry . reboot. confirm that the service is running.

Next step should confirm the report service whether  works. Then try to access HTTP://
other error message was prompted :
  The report server cannot decrypt the symmetric key used to access sensitive or encrypted data in a report server database. You must either restore a backup key or delete all encrypted content.

It seems that lost the encrypted key . Just try to restore the key from previous backup. Ok, fixed. So, keep in mind doing a backup for report service keyis very very important procedure .