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Yes, it sounds like your CPU Fan is about to blow. Once it goes completely out and not turn on, your laptop will run hot and shut down. The fan is replaceable and they don't cost a lot. However your laptop will have to be completely disassembled to get to it and therein lies the cost. Get a quote from your local repair shop, then try these guys at: http://www.generalsystemsconsulting.com They will repair it and ship it back via Fedex or UPS and their price will beat most quotes including the shipping.
This sounds like a capacitor going bad on the motherboard. Or could also be the max temperature setting in the bios has been reached.
Heat: Make sure the laptop has good air flow and NOT sitting on your comforter. Too many laptops die of heat stroke while in bed with it's user. :)
Check the bios temperature settings and google for the default. Setting them a little higher can stop the shrill sound but too high and heat damage can occur. It is a safe guard built into most PC's today.
Capacitor: This must be serviced as soon as possible. Motherboard if still under warranty will be replaced.
The high pitched noise you hear is most likely caused by the CPU cooling fan on your laptop. If you suspect that this high pitched sound is caused by the fan going out, you can spray your laptop with compressed air to get the dust off of the fan. This solution will make your laptop work at a cooler temperature, and reduce the noise.
If the problem persists, seek a certified laptop repair specialist.
there is a possibility that your source wire may be frayed so look at the thin wire carefully.Then if you can see if the noise is coming from the transformer which is the black box.If the noise is coming from there it probably will last a while but a resistor may be having trouble,it should not cause any damage as the transformer will stop working.Check to make sure the transformer is the correct one also.It either is -(+ or+(- which means negative outside plus inside or plus outside and negative inside you can find the icons printed on the transformer usually on the back side,look for the same icon on the bottom of your laptop
This usually happens if you press the hot keys like 'shift' for more than a period of time.
Else if the sound is from the base of the laptop, it could be due to overheating, so keep the laptop in a flat surface when you are working on it. Else it cousl damage your motherboard.
I'm not aware of other beep sounds.
no its not exactly a HD failure u need to remove the keyboard and look if something is stucking in ur fan...there might be the possibility of dust in it and even a minute thing can damage a lot..
Does beeping noise happened before turning on laptop? If yes unplug the laptop from the AC Adapter. Just leave AC Adapter ON and connected to the power outlet. Check if AC Adapter is the one making beeping noise. Note: This is an issue with dell AC Adapter laptops
If no beeping noise in AC Adapter then proceed checking it from the laptop. Does beeping noise happened immediately when laptop is turned on? If yes then it might be laptop's hard drive creating the sound. Try to check the BIOS in your laptop under the category performance if the HDD Acoustic is ON either in Normal or Performance. Note: When laptop is in performance the hard drive makes noise due to its speed, this is normal if BIOS HDD Acoustic mode is ON to performance.
If the noise only happens when sometime while working on the laptop, this might be cause by the laptop fan. This also happens after turning on the laptop fan my have dirt and dust, please do check.
If fan was cleaned, HDD performance was checked and AC adapter was checked then, carefully sense if noise is coming from the internal speakers.
Download the latest BIOS update for your laptop then flash the BIOS. Make sure battery and AC adapter are connected when doing these.
have a look at the fan on the processor if its running slow it will be making that noise so your processor is over heating and in turn making your pc run slow. replace this fan now. if your processor overheats too much it will burn out.