ibook Clamshell modem shield
Do I need to put the modem shield back on when reassembling a clamshell and what could happen if you don't
The shielding usually is there to protect the circuitry from interference caused by
proximity to other frequencies that may adversely affect a computers function...
Others mention trying the computer without. The issue may also relate to
any interference the iBook may generate affecting other products nearby.
Can I leave out the EMI shield?
So the recommendation would be to replace the missing shield even if you do not
intend on using the internal dial-up modem, as other connections may be exposed.
Good luck & happy computing! 🙂