Hello and welcome to Bleepingcomputer.
I am offering you a web site that has various techniques for various laptops, I did not see your specific laptop included in the list of laptops, but sometimes a reference to one Compaq laptop may be helpful for another. Scroll down each page and examine each image these have directions and solutions that may be helpful to you.
This web site page has a PREVIOUS ENTRIES back button located near the bottom of each page, look for it and click on it and another list of laptops will be listed along with various types of repairs, just scroll down the page until you find something that might be of some assistance to you. http://www.insidemylaptop.com/category/3-compaq-hp-laptops/
I did try a search of your model number at the above mentioned site and it came up with no results, which could very well mean no one has added your Evo N610C to the site as of yet.
Here is a link to Hewlett Packard's web site for your laptop. http://h20000.www2.hp.com/bizsupport/TechS...p;submit=Go%20»http://h20000.www2.hp.com/bizsupport/TechS...ectID=c00035844
Also you may find satisfactory results if you use a can of compressed air and blow out the laptop using the plastic straw included with the can of compressed air, pointing it into any air vents or openings you can find, try to concentrate it in the areas of the video processor and CPU.
If this fails to resolve the issue, you may have to open the laptop case, to gain better access to the internal components.
Edited by MrBruce1959, 02 October 2010 - 01:49 PM.