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Common computer problems

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I like to share this topic with some new guys here. Few computer harware problems and their solutions.

Common Problems Encountered
Sound not coming from speakers: First check the back side of the computer. Few computers may have their speaker connections on both, sound card and modem. You have to plug

the single stereo speaker plug into socket on the soundcard usually it is marked Audio Out (or in some cases Speaker)

Computer start up as normal but but the screen is black:
As obvious as this may sound it is probably a cable not attached correctly, or the monitor power button being turned off. Please unplug all the cables and replace them carefully.

Sometimes my system just crashes for no explicable reason:

Fuzzy image on monitor:
Monitors are very sensitive to electromagnetic interference. First ensure , your speakers are not very close to the monitor and that there is no other source of interference, especially

from microwaves, TVS and radios, dishwashers and washing machines. Cell phones are frequently the cause of that problem.

Modem error message says, "No Dial Tone":

Don't attempt to change any COM port or any other modem settings. This is a problem that ALWAYS external to the computer. All modem cables are not the same. Always use that

one which supplied with the modem. Telephone cable from wall socket should go into modem socket marked Line In. Consider that telephone socket is faulty. It could also be a

faulty telephone extension line (just because it works on a phone doesn't necessarily mean it will work on a modem - and don't ask me why), or some other external factor. We repeat:

Please do not change any of the modem settings. "No-Dial Tone" is always an external problem.
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