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my $pcname;
foreach my $objItem (in $colItems) {
...
   $pcname = $objItem->{DNSHostName};
   last;
}

my @pcnames;
foreach my $objItem (in $colItems) {
   next unless $objItem->{Description} eq "...";
   push(@pcnames, $objItem->{DNSHostName});
}

use List::Util qw( first );

my $pcname = map { $_->{DNSHostName} }
             first { $_->{Description} eq "..." }
             in $colItems;

my @pcnames = map { $_->{DNSHostName} }
              grep { $_->{Description} eq "..." }
              in $colItems;

my @pcnames = map { $_->{DNSHostName} }
              grep { $_->{Description} eq "..." }
...
   if @pcnames != 1;

my $pcname = $pcnames[0];