可以修改如下:
With the hand-held equipment coming into fashion,the power consumption problem becomes more and more apparent,manifesting itself both in limiting the equipment’s capability of working non-stop and in bringing about the overheating problem.
解析:
with 是介词,后接名词短语,所以谓语动词come要改为coming.
equipment 是不可数名词.
“问题变得越来越重要”不太合理,应该是“问题变得越来越突出(或明显)”.
Not only because ...属于原因状语从句,不能单独构成句子,需要与主句配合才完整.(Because...单独成句的话,通常用来回答Why.)