Raw Input
The datafile consists of records where
  1. each record may contain only one line or multiple lines.
  2. the first line of a record is of the format:
    Machine hostname-of-machine
  3. other lines of a record (if exist) keep other information.
For example: 
Machine pc-a01
Machine pc-a02
 connection time-out.
 unable to update virus code.
Machine pc-c01
Machine pc-c02
 packets loss beyond 33% while ping.
 unable to open share.
Machine pc-c03
Desired Output
As seen in the example, only machines pc-a02 and pc-c02 contain extra information, what we want is keeping data of pc-a02 and pc-c02 while removing other: 
Machine pc-a02
 connection time-out.
 unable to update virus code.
Machine pc-c02
 packets loss beyond 33% while ping.
 unable to open share.
Script and Comments
Script1 
[ 1] /^Machine /!b
[ 2] $d
[ 3] N
[ 4] /\nMachine/D