This can be the fan or what is more common is just dirty fans and ducts. It takes very little dust or lint to stop the airflow in a laptop and if you have pets, gas heat or use near a kitchen (hot cooking oil vapours) they will need cleaning as little as every 2-3 months. The more it runs with the particles in the air the faster it gets dirty. Can can blow this out using compressed air. You need to take the battery out then insert something to stop the fan from turning. The compressed air will turn the fan too fast and risk burning its bearings out. All you might see is one good puff of dust and thats all it is. You blow the air in through the fan and then reverse through the exit duct. That should knock the dust loose. You might have t pick out lint through the grill but get it as this will block more air and collect the dust faster. You can do it yourself or most shops will do it fairly cheap.
This is the cause of the majority of heating issues.I've only had to replace a handful of fans over the years. And I've ended up with free laptops where the dust was the only problem. Most times the fan doesn't move that much air so people think it is out. If you set your fan to max cooling under power properties you will get as much cooling at it is designed to do. Normally it will be off or very low speed until it hits a certain temp than will kick up the speed .
To replace the fan you need to take the laptop almost totally apart. The display comes off, the keyboard off and the case split and usually the motherboard comes out as well. Before you attempt this try blowing it out first. Then look at pictorial instructions so you have an idea of the work involved. It isn't tricky other than splitting the case but it is involved and you can damage the board with static.The fan will run you $20-$40 from a laptop repair parts place (search for laptop repair parts) Most shops do not do laptop repairs but send them away to a repair depot so you may have a bit of trouble finding someone to do it for you.
Both the laptop and the tv should have a VGA female connector
that will transfer the video. If your tv is a flat screen (meaning newish) then it should also have a headphone jack.
This is rather LENGTHY and detailed dhivi, advising you in advance.
All of the components for a laptop are crammed inside a tiny box with a poor cooling system.
The cooling system consists of a small fan and Heatsink. (Fan/Heatsink Assembly)
The Heatsink Assembly is shaped like a U for the Compaq Presario CQ40 series.
The U shaped Heatsink Assembly is composed of a finned Heatsink, Cooling Tube, and metal plates (2) attached to the Cooling Tube.
The finned Heatsink is on one end of the Cooling Tube, with the 2 plates of metal spaced around the Cooling Tube away from the Heatsink.
The 2 plates of metal sit on top of the Processor, and graphics chipset. One on the Processor, one on the graphics chipset. (GPU. Graphics Processing Unit)
The Cooling Tube is a hollow copper tube slightly flattened, and filled with Nitrogen gas.
Heat is absorbed by the plate on top of the Processor, and plate on top of the graphics chipset, and transferred to the Cooling Tube. The Cooling Tube absorbs the heat, and transfers it to the finned Heatsink.
The Heatsink then radiates the heat away. Air flow from the fan flows through the fins of the Heatsink, and helps carry the heat away.
Underneath the two metal plates is a thermal medium. For the processor, Compaq used Thermal Paste. For the graphics chipset they used a Thermal Pad.
Below is a link for disassembling a Compaq Presario CQ50, CQ60, or CQ70 series laptop. VERY similar to the CQ40 series,
(Your laptop is one of the Compaq Presario CQ40 series of Notebook PC's. The exact Product Number is on the bottom of the laptop in a white Service Tag. P/N = Product Number)
Scroll down the page, and view Steps 20 and 21. This shows you what your Fan/Heatsink Assembly looks like.
(Also a good guide for disassembling your laptop)
In Step 21 you see the Fan/Heatsink Assembly removed. Looking at the two chipsets on the motherboard,
1) The Rectangular chipset on the Left, is the Processor 2) The Square chipset on the Right, with the purple diamond in the middle, is the graphics chipset
The purple diamond is a Thermal Pad.
In my opinion a Thermal Pad is junk. Thermal compound (Paste) is interweaved in the fabric of the Thermal Pad. Thermal paste dries up after being repeatedly exposed to heat.
This is why the top of the Processor, and bottom of a Heatsink on a desktop computer, needs to be cleaned off, and new Thermal Paste applied every so often. The Thermal Paste dries up, and loses it's conducive properties. (Even if it's Artic Silver 5)
Primer: The top of a Processor, and bottom of a Heatsink are not perfectly smooth. A microscopic view would reveal, 'Pits, Hills, and Valleys'. This imperfections create air pockets when the Heatsink sits on top of the Processor.
Air is an Insulator, not a Conductor. Thermal paste fills these voids, (Imperfections), and is an excellent conductor of heat. It helps transfer the heat from the top of the Processor to the Heatsink.
Same thing for the two metal plates which sit on top of the Processor, and graphics chipset in a laptop. The top of the Processor, and the top of the graphics chipset are not perfectly smooth. Neither is the 2 metal plates which sit on them.
The Thermal Pad has dried up, and is allowing the graphics chipset to overheat. This is what causes the lines you see in the LCD screen.
The Thermal Pad should be removed, and the top of the graphics chipset Thoroughly cleaned. Also the top of the Processor. The bottom of the two plates of metal should also be Thoroughly cleaned. Then new, fresh Thermal Paste should be properly applied.
The Thermal Pad can dry up in a laptop in a years time.
To add: The graphics chipset is surface mounted to the motherboard. The Processor in a Compaq Presario CQ40 series Notebook PC is an Intel Core 2 Duo T7300.
The mounting of the graphics chipset is a surface mount called BGA. Ball Grid Array
Instead of pins on the bottom of the graphics chipset there are solder balls. The surface of the motherboard has matching Copper Pads. The graphics chipset is set on the motherboard's copper pads, and heat is applied. The solder balls melt, and solder the graphics chipset to the motherboard.
With constant overheating due to the thermal pad has dried up, or due to overheating in general, the solder joints start to melt, and the graphics chip loosens from the motherboard. This causes a poor connection, and the results may be what you are seeing with your laptop.
This is the download page for the Service Manual (Free) for the Compaq Presario CQ40 series of laptops. I chose the Compaq Presario CQ40-200 CTO Notebook PC, but the Service Manual is for all of the CQ40 series,
Click on the file name > Compaq Presario CQ40 Notebook PC - Service and Maintenance Guide After you click on the link it may take up to 30 seconds before you see the first page, and addional time for the PDF file to fully download.
Take out the battery and also take out the memory as well. If the laptop still won't turn on, then the motherboard is bad. If the laptop gives you a beeping sound, then reseat one of the memory sticks to see if you get video. If not then try another memory stick into the other slot. If you still don't get video then you'll know for sure the motherboard is bad.
This is illegal in may states. Even if you hacked the wifi pw? how well do you think the network is protected? how do you not know that you will be exposed to harmful programs or that you will not be "hacked"? Im watching you now. Please put some clothes on. It is embarrassing.
How many blinks between pauses if there are pauses? Look at this chart.
Number of Blinks or BeepsLocation of Blinking LEDsComponent Being CheckedError Condition
Continuous glow
Battery power LED
Battery
The AC adapter is attached and the battery is charging, but does not yet have sufficient charge to power the notebook.
1
Caps Lock/Num Lock
CPU
CPU not functional
2
Caps Lock/Num Lock
BIOS
BIOS corruption failure
3
Caps Lock/Num Lock
Memory
Module error not functional
4
Caps Lock/Num Lock
Graphics
Graphics controller not functional
5
Caps Lock/Num Lock
System board
General system board failure
6
Caps Lock/Num Lock
BIOS
BIOS authentication failure
Continuous blink
AC power adapter LED
Power adapter
Insufficient power
Your thinking along the right lines, first of all check the laptop using an external monitor, if you get the same problems on an external monitor it is likely to be mainboard/GPU fault. If display is fine on an external monitor I would recommend taking the laptop apart and check the LCD cable is connected correctly as the first port of call. If that doesn't cure your issues I would look at replacing the LCD cable, then maybe the screen.
put in your exact model number and click on the drivers link, download the touchpad driver and install, scrolling is automatically enabled. When you download a new driver it will over-write the present one and all it's settings.
