An experienced tech sitting down with you at your table may be able to diagnose your problem in a short time, but for that same tech it's often difficult to pinpoint the problem from verbal descriptions alone.
First, you said that you purchased the computer from a friend. Are you quite sure everything's brand new ? Even if it is, there's always the possibility that you're unlucky enough to have a less than perfect component. I've had problems with a few SMPS'es that came with 'ibox' cabinets. Some went dead within a few minutes (blown 5V rectifier), with some others the fan failed within a few weeks.
Secondly, your SMPS may be fitted with a temperature-dependent fan regulator. In such a case, the fan will run at low speed until a certain temperature is reached, after which the speed will automatically increase. Even if that's the case, it should not give out a loud sound or vibrate excessively. Either the fan is faulty or it's being supplied with an abnormally high voltage.
Since you said the rattling sound can be stopped by placing a hand on the cabinet, it could be that the fan is OK, but something is a bit loose somewhere in the cabinet. This is one of those things that an experienced tech can probably isolate quickly, but difficult to diagnose from a distance. Try to determine exactly which part is vibrating.
BTW, it's normal to have hot air blown out. That's what the fan is supposed to do.
If you have some experience with a soldering iron, you could try replacing the fan. They're cheap enough.
|