One SONY SVE14AA11W LAPTOP came to me with NO DISPLAY.There was huge dust inside in the fan. I cleaned everything and applied Heat Sink compound on the CPU and other IC. Still no display.

Three reasons a laptop will overheat and shut down:

1. Dust - Dust inside, dust clogging the vents, dust around the cpu and heat sink. Blow out the dust with a can of compressed air.

2. A Fan not working. Take the laptop apart and replace the fan. Just put Dell Inspiron 1501 Fan in the seach box on ebay. You'll see plenty of them at:

http://www.ebay.com

3. Thermal Paste around the CPU and Heat Sink has dried up or is too thin to keep the unit cool. Apply a fresh coat of thermal paste on the cpu and heat sink. Even if you just change the fan, apply a fresh coat of Thermal Paste.

Also you can buy a Laptop Cooling Pad at Tiger Direct for under $15. It plugs into one of the usb ports and the laptop sits on it. It has fans to keep the unit cool.

http://www.tigerdirect.com

There are several things to look for here.

• The CPU Heat sink (the big metal block with a fan) may not be making good contact with the CPU surface area.
• Thermal compound may have not been applied between the CPU surface area and heat sink
• The heat sink and fan are not sufficient enough to cool your CPU
• Dust buildup is not allowing proper circulation of cooling air

If this system is not a name brand and covered by warranty then I would remove the heat sink (carefully) and verify that the mounting bracket is not broken or loose. I would check that ample thermal compound is applied, and if not use rubbing alcohol to remove all compound from the heat sink and CPU and purchase a tube of compound to apply yourself. I would also thoroughly clean the heat sink with compressed air.
If the heat issue continues then you will want to consider upgrading to a more powerful cooling solution.
The CPU fan should run constantly but in some systems will run between 50% and 100% speeds assuming a variable temperature control is applied to the system via motherboard or third party installation.

Remove the bottom pan to expose the cooling fan, clean all dirt out of the heat sink and fins,and clean fan, next remove the heat sink to expose the processor ic, remove the old thermal grease with rubbing alcohol, and apply fresh thermal conductive compound to the heat sink and processor, "not to much! just enough to cover the critical areas and assemble. In most cases this will solve the shutdown problem.

Replacing the fan on the CPU or the GPU, Graphics card, is actually very simple and the fan will run about $20 to $25 depending on what type of fan you get and where. Aside from a new fan you will need a small tube of heat sink compound. The fan just clips on to the CPU. Make sure you get a fan that is designed for your CPU type or it will not fit properly. For instance, if you have a P-3 CPU you can't fit it with a P-2 Chip or P-4 chip, they won't mount correctly and subsequently they won't work. When you go to Best Buy or the computer shop your to buy your part tell them what type of CPU you have and that you want the cooling fan and the heat Sink Compound to mount it with. They will be able to direct you to the proper fan Type. Also, while you have it opened up take the opportunity to use canned Air to blow the dust out of the machine. If you are doing what is called Over Clocking it is important that you know you may have burned the CPU out as this causes the CPU to heat up more than it would if you just had it installed for the proper speed. The old fan will be difficult to remove because the old heat sink compound will have formed a bond between the fan heat sink and the CPU itself. If you have to do any prying to remove the old fan make sure you do so carefully and make sure you clean the old heat sink compound off the CPU before you try mounting the new fan. When you apply the new Heat sink compound you want to place the compound in the center of the CPU and let the heat sink spread the compound out in a thin layer. This compound needs to be spread evenly so it forms a good bond between the Heat sink and the CPU itself to properly transfer the heat from the CPU to the heat sink so the fan can properly cool the CPU.

1. Try blowing the dust on the motherboard, if any hard dust is present, use soft brush to clear it.
2. Again remove the Heatsink on the processor, completely clear the compound using soft cloth, There should not be any hard particles or dust left, apply heat sink compound on both the heat sink side and on the processor, put back the heat sink and fan.
3. Check whether the power button on the cabinet is not struck and functioning if possible try to replace the button.
4. Blow the dust even from SMPS or try with another if handy.

This is a difficult problem because I cannot determine the exact cause because of limited information.
This problem will need to be solved by trying one thing at a time.
Do not do all these together.
1. Reseat the RAM.
2. Remove the RAM and get it tested at your friendly computer store.
3. Reseat the hard disk
4. Run a virus scanning program on your computer/laptop
5. Check the fan to see if it spins freely, if not replace the fan
6. Loosen the dust from the fan and heat-sink assembly and remove/vacuum the dust.
7. Try removing the heat-sink, remove the old heat-sink compound and apply a new coating of heat-sink compound to the CPU and re-attach the heat-sink to the CPU.
8. Do a system repair with the Windows installation CD
9. If nothing works then re-install Windows, plus the laptop's device drivers and your programs.
You may need assistance from a computer savy friend to help you. Let me know how things work out.

Your heat sink vents may be jammed up with fluff and other debris.

If you're not comfortable removing the bottom pannel and using some canned air to clean out the heat sink fins, I would take it into a repair depot and have the techs there apply a new application of heat sink compound and clean it out for you.

clean the cpu cooler slots and replace the thermal compound on the cpu ....make sure you clean off the old thermal compound .....only a thin layer of new thermal C will do all most see through ... hope this helps my friend

Right no need to worry if your laptop is overheating. Just open fan panel which is at the bottom rtop right on the casing. The SZ series clogs dust inside the fan wings and the heat sink and hence the BLUE screen error comes. You can take the heat sink out ( L SHAPED) and put it back on after cleaning it with a compound which is a cream type of substane used for heatsinks. You can buy it from any hard ware store. let it dry and your ready to go :)

It sounds like a thermal shut down when the processor over heats,one thing it might be is that the heat sink is not seated properly on the processor.When removing the heat sink make sure you have thermal paste to place between the processor and heat sink.That should give you a good starting point.