caz said:
in the summer my room gets very hot, is it safe to use my
computer while the cover is off and with a fan aimed
towards it to reduce overheating?
That frequently works (I've used it), but:
1. With the covers off, the shields are down; the EMI radiation from
the innards of your PC might interfere with TVs and other stuff in
your house. And, your PC probably violates FCC regulations, but
nobody really cares about that little technicality.
2. The fan might cause cables inside your PC to shake enough to
dislodge. Don't go crazy with high-velocity fans, since modest
air flow is enough. And, pay some attention to aiming the fan
at the hot devices: maybe the CPU chip, maybe the HDs; when I
used a fan, it was to cool the red-hot video card that wouldn't
work without extra cooling.