Computer sounds different than normal when it runs

When you say it just hums, do you mean that it sounds like it is running but isn't heating? Or do you mean that the sound is different from when it normally runs? Is it quieter or noisier than normal? Do you hear the fan running or is that sound missing?
IF it sounds normal (or about the same as when it worked), but it's nust not heating, then it is probably a bad magnetron tube.

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After dead battery, readouts
including gas used do not read normally. These "learned" results have to be relearned by the computer-----this will
take driving 100 miles or so. You would only do that if it starts and runs with normal sounding engine performance= if it does not start/run sounding normal, diagnose and fix your other problems, not just the computer memory.

The scanning for codes will not help until the computer "remembers" something----which does not happen with a completely dead battery---memory is erased. I am writing this for Ali Fardshisheh on Apr 20,2014. (There are many other "learned" data elements in the car computer that will not be accurate until
you drive about one hundred miles, so the computer can relearn them thru a NUMBER of normal operating cycles.....IF IT DOES NOT START AND SOUND NORMAL, you cannot apply this solution.)
BEEN THERE, DONE THAT! Just as an example, when I
went thru the 'really dead battery' cycle, the gas used was not
displayed when I got back to running. After I drove thru many
apparently normal miles, the mpg crept up very SLOWLY, from
1, 2, 5mpg, until it eventually plateau-ed at its usual between 15 and 20mpg. I assume there are many other 'learned' readouts that would behave in the same way------this was the only readout I was following as I was not interested in the others, but I presume numerous others are operating in a default mode thru many driving cycles until a memory data-base builds up.
Now I have to go see my DeVille mechanic. I will try to check later and see if you have a response. I have a good mechanic, if you need one. Best wishes....

If it is running correctly don't worry about it. And...it's not the sound of your computer, it's the sound of the ventilation fans that have not increased RPMs and are running normally. If the computer heats up the fans speed up to keep it cool - that's the noise you are talking about (probably, you did not give details so I am guessing).

For now if you can still use the computer download antispyware tools like spybot and avast antivirus run a scan. Also you can check the audio settings for your computer, check if the audio was changed with a different one. As is the case, sometimes the best answer is just taking the time to look if somebody changed something. If you can't go in normal mode, another option is Safe Mode with Networking, which will let you go in Windows and can still connect to the internet, and from there you can download the tools. Have a great day, goodluck!

try this go to services and RESTART windows audio.

Normally when you remove the headphone off the laptop the sound switches back to the laptop speakers.

thats normal change your oil frequently evry 1000km

You probably have a dead cylinder. like if you have a six cylinder it might be running on only five. could be because of a bad spark plug, ignition coil, fuel injector, plug wire. you should get it checked out.

Firstly how on earth did it get hit with lightening? i have several computers in my house none of which have been hit with lightening during a storm.

secondly it sounds like some of the components are damaged i would try the different components in different machines to rule them out if certain components are damaged you will have to replace them.

tape running path has been misaligned due to usage. it is a normal problem. realign it at any authorised service centre