Over heating problems

When the CPU overheats then it will shut down (i.e. thermal overload) and won't boot up again until it has cooled down. If this is the problem is not fixed then the CPU will eventually fail.
A faulty fan causes the problem or the fan and heat sink assembly are clogged with dust.
Check the CPU fan to see if it spins freely, if not replace the fan.
If the fan and heat sink is clogged with dust the remove the dust and make sure the vents are clear and dust free. Use a small brush and can of compressed air to do this.

hi you really need to clean your fan quickly as it cools down the processor .if you dont the laptop will overheat and fry your motherboard

by any chance has the sleep mode been activated.If you think it is the fan and that the computer is overheating then get a normal house fan and let it blow over the motherboard.If this keeps the computer running for several hours then heat is definitely your problem.
If this doesn't work I would suggest that you have a problem on the motherboard particularly in the area of the CPU.
Regards

I have an hp 6735b that shut down on me and wouldn't restart due to a heat related problem on the motherboard. I wound up replacing the motherboard for $115 from getcomputerparts.com in China. And, the labor was like $75 to do the job at a local computer shop. I understand that hp laptops have a problem with dust building up in the fan area and causing the motherboards to overheat, melting solder on the video chip.

Some companies can 'reflow' the solder by disassembling the laptop and applying heat to the video chip with a reported 90% success rate for a fee of $75 to $125, I've read on Ebay.com.

Good luck with this repair.

Hi

Please check your processor fan is working or not, if no then go the Hp service center for repair the FAN.

Hi lvadim1993,
In other word your PC works intermittently. Here is what you have to do. Check and remove the processor cooling fan and heat sink clean the cooling fan and heat sink. If you have a thermal compound remove the old thermal compound and put a little amount at the center of the heat sink. Reinstall it back the processor cooling fan and heat sink and make sure It install properly even and snag tight. re plug in the cooling fan connector to the motherboard. If you have a video card remove and clean the video card connector and the cooling fan and heat sink with air blower same also to the memory card. Use the air blower to clean the motherboard and the entire internal of the PC. Reinstall the video card and the memory card and make sure that they are install properly. replug in the video cable and the pc power cord and turn on the PC. this will work. the computer is just over heating. I hope that this information will help you solve the problem.
HRH

The Problem Is with the SMPS or Motherboard 100 percent Guaranteed

With the laptop running, observe where the Air Intake Duct is at. Make sure this duct has plenty of room around it, to bring air in.
Typically this duct is located on the bottom of the laptop. Sometimes it's up on the side next to the Exhaust Duct.

Either location brings this duct in a perfect(?) spot to bring in all kinds of foreign debris. Dirt/Dust/Food Particles/Lint, and so on.
Also makes it so it's easily blocked by the users clothes if they sit it on their lap, or blocked by bed, coverings, the couch, or carpet floor.

The opening you see narrows down into a Cooling Tube, the width and height of your index finger. This makes a funnel effect for the foreign debris.
Since the main objective of the Cooling Fan, Cooling Tube, and Heatsink, is to keep the processor cool, clogging these cooling components can lead to a detrimental effect in a hurry!

Solution? I suggest cleaning out the Air Intake Duct, (Do Not blow air into the Exhaust Duct!), with a can of compressed air for computers. These cans of air are readily available in a lot of places. (Office supply stores, computer stores, Walmart, and so on)

Remove the AC adapter, (Charger), and battery before you begin.

I think your system may be heated check out your processors temperature, if it is very hot change your cpu fan.

Sometimes depending on the version of BIOS there is a thermal shut down feature,If the CPU gets to hot it will shut the entire system down.What you can do is replace the CPU fan and apply more grease in between the heat sink and the CPU chip.If this does not solve your problem then you may have damaged the CPU.the best way to fix this is to replace the motherboard and CPU.Try replacing the fan first because if your computer has the thermal shut down feature then chances are that it protected the motherboard and CPU from any damage.Try the simple things first! GOOD LUCK.