Doesn't seem like the hard drive noise. Just did performance check, dumped cookies, all extra internet and unnecessary files, cleaned disk and reformated drive. Noise is probably diminished but still comes on and off fairly frequently when laptop is on. Also does not seem excessively hot.
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Clean your computer of Junk: temporary files, Internet explorer or firefox temp files, cookies, crash dumps. If your computer is running OK you may consider erasing all the restore points except the last ones. Run the windows cleaning of the C:Drive. While you may be storing data on the D:drive, you may just have been copying them onto D but not removing them from C. An do perform a defragmentation.
If the noise isn't coming from a speaker, you could need to replace the fan on your computer. The bearings for it might be busted, another issue could be the speaker wire isn't fully connected internally, which you could fix by popping off the top power panel area and fastening the speaker wire in it.
I hope this helps, if not I apologize. The question isn't super vague, but it still has holes in it. :) I can to help more if you post more about the issue.
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.
With a loud squeal, it is either your hard drive eating itself up or a fan trying to spin. If it sounds like a pretty songbird caught in a blender, it's probably your hard drive. If it sounds like your younger brother trying to make the most annoying sound in the world, it's probably your fan. To check you could blow compressed air into the fan ports to see if it dislodges a lot of dust. I'm guessing that it's your hard drive though because it is accompanied by the clicking which may be your hard drive trying to reset itself, but having a physical problem. Don't worry, after a few minutes it usually fails completely and you won't have to listen to that noise any more. Maybe take the hard drive out and put it in an external case and see if another computer can read it. Or go on Craigslist and find someone to fix it for you for $40.
Chances are it is the fan that is making the noise. You can determine this by stopping the fan from spinning while the laptop is working for a short period. If the noise is gone then you know it is the fan.
Remove the fan from the heatsink and take it with you to a electronic hobby parts shop, they usually have a range of computer fans, select one that is the same size as your faulty fan. You may need a new connector or cut the connector off the old fan and solder it onto the leads on the new fan. Make sure you insulate the soldered wires so that they don't short against each other.
Fans on laptops run when the CPU is taxed. The more its taxed the louder it will be due to higher fan speed. The laptop over the years has gotten bloated with programs and stuff that gets in and stays on your hard drive. The more programs running in the backround the more the CPU is taxed. Try uninstalling useless programs first, empty your recycle bin, delete temporary internet files and cookies, run the disk cleanup utility then perform a scan disk and a deframent. Also you may want to add more memory to your system if it needs it. I use crucial's website (crucial.com) to scan the computer and tell me what memory I can use in my machine. Hope this info helps you out.
There are two possible things it could be, either a fan is giving the whining noise or it's the hard drive. Locate the fan on the underside and put your ear near to see if it's coming from there. If it is, the fan needs to be replaced.
If it's not the fan then it's probably the hard drive and I would not think it is going to last much longer.