Tell your friend,
A) The term 'Laptop' is really a misnomer.
If the laptop's air intake duct is on the bottom of the laptop, it should Not be set on a persons lap, a bed, couch, or directly on a carpet floor.
This blocks the air intake duct, and cause the laptop to overheat.
B) Any computer, desktop, or laptop, uses air to cool the hardware components inside the computer.
The fan that draws the air into the computer, also draws in 'foreign debris'.
Dust, dirt, hair, food crumbs, you name it.
Especially with a laptop, and even more specifically a laptop with it's air intake duct on the bottom.
(Some laptop designs have the air intake duct on the side of the laptop. They still draw in 'foreign debris')
The cooling system of a laptop is it's small fan, a finned Heatsink, and a Cooling Tube.
When these hardware components get clogged with the aforementioned foreign debris, the cooling capacity drops tremendously.
If the Processor overheats it turns off. (BIOS turns it off)
A Processor has a thermal limit. A certain operating temperature it can reach, and no more, or it turns off.
This is a Fail Safe feature to keep the Processor from burning up.
No Processor operating, No computer.
Laptop operating, have your friend quickly find where the air is drawn in.
This is the air intake duct.
ALL power removed from the laptop, AC adapter (Charger) and Battery, use a can of compressed air for computers, and clean the air intake duct.
Insert the provided plastic 'straw' into the nozzle of the can of air.
Break the plastic lock tab off of the top of the nozzle.
Laptop closed, on a table, and on edge.
Hold the laptop with one hand, and the can of air with the other hand.
Bring the straw close to the grille of the air intake duct, and use Short Bursts of air.
Squeeze the trigger in all the way, then let go quickly.
You do Not want to spin the fan inside too fast.
The fan is only designed to spin so fast.
Spinning the fan faster than it was designed for can lead to premature failure of the fan's bearings.
Once your friend is satisfied that the air intake duct is cleaned out, sit the laptop down with one side propped up on a book.
You are not supposed to tilt the can of air when using it. Doing so will let some of the propellant come out.
It is inevitable that the can will be tilted when trying to do a good job.
The laptop is propped up so the propellant can have time to dry out.
Around 5 minutes should be good.
Set the laptop down off of the book, plug the Battery back in, then the AC adapter.
Wait 1 minute, then turn the laptop on.
If this procedure leads to no avail, then it is time to take it to a professional computer repair shop.
The tech will open the laptop up, and physically remove 'foreign debris' that the can of air could not remove.
There are some laptops that have a real poor cooling system design.
For these types of laptops they need an additional cooling source.
Tell your friend they have to sit there with a fan, and wave it at the laptop.
NO JUST KIDDING!
Tell your friend that they may wish to try a Cooling Pad.
These are examples of a laptop Cooling Pad,http://www.tigerdirect.com/applications/SearchTools/search.asp?keywords=cooling+pad
If the above search link doesn't work, here is one example of a Cooling Pad,http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=4242568&CatId=3486
If your friend feels technically inclined, I may be able to find a free Service Manual online, that states how to disassemble the laptop.
This way your friend can do the heavy cleaning themselves, and save money.
I would need to know the laptop manufacturers name, and Model Number. Bottom of the laptop.