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A computer cannot function without power. Yes, this is obvious, but few realize how vital this component of a computer is until it is no longer available.

We are visual creatures, after all, and until we experience the failure of the power supply - when we can no longer turn the PC on - few give it a second thought.

The main cause for concern with a recently deceased power supply unit (PSU) is that in its dying state, it can wreak havoc by taking other components down too.

How do you diagnose a computer without a power supply? Here are some of the steps Boca Raton computer repair experts recommend to troubleshoot such a situation:

Have a replacement power supply unit.

Almost all users do not possess a second, but those who do can diagnose immediately via the replacement. Assuming you do not have one, forget this step.

Find a replacement power supply unit.

This is where things get tough, as for the average user it will likely involve taking it to a professional shop and having technicians sort it out.

Assuming you or your Ft. Lauderdale computer repair expert get it running, here's where the diagnosis typically starts:

Check the connectors.

Everybody makes mistakes, and even computer repair experts are not immune from the simplest. Simply checking for securely connected power cables could do it.

Give it a sniff.

Begin a step-by-step visual analysis of the inside, beginning with noting if there is a smell of burning plastic. If there is, immediately take it to a computer repair shop. If not, check the motherboard and hard drive discoloration.

If the PSU failure does land you in a Ft. Lauderdale or Miami computer repair shop, these steps will nevertheless make you a better consumer, a fact that is nothing to sneeze at, given some of the obstacles you will invariably face.