Please follow the steps given below:
A. Clean the dust out of your laptop:
Turn off the laptop and remove the battery and clean it:
For more information, please click the links given here: Click Me 1
Click Me 2
Some hidden malware/spyware/adware could be causing this issue:
I suggest you to scan your computer using free version of Super anti-spyware software. This will remove all of the malwares, spywares and viruses from the computer.
Note: If you already have installed Anti-virus programs like Norton, mcafee, CA, kaspersky on the computer, still I suggest you to download and install Super anti-spyware as the Anti-virus program does not remove Malwares/adwares/spywares effectively.
You can download the free version using the link given below:
Please run quick scan to complete the scan in 10-15 minutes.
And if you can take a second to rate my service(-OK or more -by clicking stars at the top of the page and choose submit), to credit me for my time, work and efforts, that would be greatly appreciated.
You can continue working with me even after rating. Thank you.