多选题When a computer does not recognize an internal modem， a technician should determine whether：（）Athe modem is seated properly.Bthe number being dialed is valid.Cthere are resource conflicts.Dthere is power to the modem.Ethe modem speaker is enabled.
题目
多选题
When a computer does not recognize an internal modem， a technician should determine whether：（）
A
the modem is seated properly.
B
the number being dialed is valid.
C
there are resource conflicts.
D
there is power to the modem.
E
the modem speaker is enabled.