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You may have to take the laptop apart. My Acer was not charging because my son would have the a/c power adaptor rub against his leg (where it entered the laptop)...But !!! first do you have a voltage meter, check the power supply 1st probably a bad a/c adaptor. If not go to YouTube and see if there is a video that shows how to dismantle your laptop. Be happy it is not your cooling fan..they build the entire laptop around the cooling fans. A trip to the dentist is more fun than replacing a laptop cooling fan.
ONE THING HOWEVER Karl, to work on this All-In-One you need to wear an ESD wrist strap, and have it's alligator clip connected to a good ground source. This is just like working on a LAPTOP computer, NOT a desktop.
If your fan is not turning at all then it is probably dead, the bearings are likely clogged with dust and such. The PC is shutting off because of heat buildup on the processor chip. You need to do an Ebay search for your model and order a fan right away. Continued running of your sysem without a fan will kill the processor and motherboard. You should be able to get a replacement fan for your computer for less than $15 including shipping. Your local computer store may have one to fit your system but they may charge more for it. To change the fan is very easy, the left side of the case will come off your system, right under the power supply is the processor and heatsink and the fan. Disconnect the old fan and reconnect the new unit.
Have you tried using the restore point? Go to start, control panel, performance and maintenance. on the upper left corner click System Restore. Choose the option restore my computer to an earlier time. Click next, Choose a date where you have remembered your computer has a sound. click next then OK. You can change restore point anytime. Else, reinstall your audio driver.