A technician troubleshoots a broken PC only to find that a strong burning odor is coming from
inside the case. Which of the following parts MOST likely experienced a level of electrical burn?

A.
PSU
B.
Processor
C.
CMOS battery
D.
Hard drive
Explanation:
http://forums.thinkbroadband.com/hardware/4194025-that-acrid-electrical-burningsmell.html?fpart=all&vc=1
a: A- PSU : The power supply will go bad especially if you are a gamer that is doing the most. A cable could short anywhere in the case but the ?? is asking for the (MOST).
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