After removing the CPU fan to clean it I have no video
I noticed the heat synch for the cpu was very hot so I removed it to clean the it along with the fan whch were very full of lint, after replacing the heat sync/fan now my computer comes on but it does not display any video at all, nothing from the bios, it is complely blank. I can hear the drive spinning up and thats it. Any clues? I would really appreciate it.
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From them I am willing to bet you still have the same problem. I have experienced the exact same problem on other HP's and found the problem to be thermal run-a-away of the CPU. This is caused by the thermal compound deterioration between the CPU and Heat sink that the fan cools. The lack of hot air and the speed of shutdown indicates that the CPU is operating near thermal limits most of the time. Since the CPU and Video Chip share the same heat sink I believe you will tie the behavior to increased video display (Larger images etc) and CPU activity. The solution is simple in concept but can be difficult in execution. It involves removing layers to gain access to the CPU and Video chips, Removing the heatsink, cleaning off the old compound (which will be dry and hard) from both chips and heat sink, adding thin layer of grease style heatsink compound, and reassembling. Another thing you can try is to buy a fan heat pad for under you laptop that plug into your USB port. Radio shack was selling them for $14. If the problem disappears or greatly improves you have proven the thermal issue and can decide what to do about it. Perhaps the pad will be just fine for you. Let me
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.
The Toshiba Satellites were will known for heat problems, the bottom of the laptop needs to removed for access, the cpu fan, heat sink, must be removed for cleaning, when all dirt is removed including the fins. Clean thermal conductive grease off the heat sink and cpu ic, apply fresh and assemble, if not sure get a professional.
The cpu processor is getting to hot, check to make sure the cpu fan is working properly, if it is then the laptop must be taken apart. Chances are it is dirty and needs cleaning, the heat sink should be removed from the cpu for cleaning out the old conductive thermal grease and new applied. If the cpu fan is not functioning it must be replaced.
If there is no activity when you power up then it could be the CPU.
Remove the CPU and check the CPU to see if you have not bent any pins. The CPU can only be installed in one position.
The CPU when removed usually sticks to the heatsink.
The CPU should be removed off the heatsink.
The CPU is locked onto the CPU chip holder, lift the locking level up to release the CPU or there may be a locking screw instead of a lever. Turn the screw anti-clockwise to release the CPU lock.
Insert the CPU in the chip holder and lock the CPU in place. If it a screw lock then turn the screw clockwise to lock the CPU in place.
Smear some fresh heat sink compound on the CPU and heatsink and place and then lock the heatsink in place.
Your Laptop seems to be full of dust - Maybe your CPU Heat sink FAN cannot turn because if this THUS causing your laptop to heat up and shut down again to prevent your CPU from receiving damage due to high temperature.
Close your laptop lid, then put the unit on its backlcd. Make sure you disconnect the Battery and the A/C Power chord. With the emty battery slot is facing you, take note of the screw that is facing you to the right on the bottom cover. There might be others like this in the same area. The cover that you need to remove is of rectangular shape, and the largest cover.
When you have removed it you should see the CPU Heat sink and a FAN. This is the part where you blow the unit out at that spot with compressed air so that the dirt will no longer block the heat from venting away from the laptop mainboard/cpu.Please check if the CPU FAN is still turning licenly. If it doesn't turn or very difficult - replace .
[ADVANCED] Then, remove the 3 screws from the CPU heat sink and thereby remove the HEAT sink completely. Remove the CPU Heat sink FAN and clean it as nessesary. Use a small flat to switch the CPU from closed to open and remove it. Then clean it with a cloth and ethanol - make sure you remove all dirt and old heat sink paste on top if it. make sure you do not touch the bottom of the CPU and handle the pins carefully.
When you are done, place the CPU back and reaaply a eyedrop of fresh heatsink paste onto the CPU, lock the CPU switch again. Then clean the backside of the CPU heat sink where it rests on the CPU. When you are done with that, place the CPU heat sink back onto the CPU then screw the 3 screws back onto the CPU heat sink and onto the mainboard. Keep the sequence in mind. Reconnect the CPU Heat sink FAN to power on the mainboard with the cable then place the cover back onto it. Tighten all screws again and reconnect battery and A/C Power chord.
My recommendations would be to remove all connections to the board.
Remove the CMOS battery.
Remove the CPU fan and CPU.
Look at the top of the CPU, if you have a crust over the top of the CPU, you will need to remove it to a clean surface.
Next, your CPU fan should be a 3 wire connection on the motherboard, within two inchs of the CPU holder.
After cleaning the CPU, re-inseart and apply a heat sink lub for good heat transfer.
Re-install CPU fan and plug in to board connection.
Re-install your CMOS battery and power up unit.
With the CMOS battery removed, the time and date will need to be reset.
Also, in the BIOS for that board, you should be able to see temps. and rpm readings. ??
Hope the CPU has not taken a dump on you.!
Before you plug in the drives and other devices, check temps. rpm and voltages.
Have fun, hope this has helped you.
This may seem like to simple, but try checking to see if the technician plugged the fan power supply into the correct pin for it. It sounds like the fan is plugged into a external plug directly from the power supply and not into the board, which would control the fan speed for you. Give a look, and maybe it's just that simple.
I would guess that the CPU overheated if the fans are noisy. I would remove the CPU heatsink clean and reinstall the CPU with the proper contact paste,reinstall the Heatsink along with a new heat sink fan, if that is the one is making noise also. Then see if it will then boot up. If not I am guessing that the CPU was damaged for the fans not workingwell enough.