D865PERL Motherboard NO POST

Check display without cabinet maybe motherboard getting short with cabinet and try new Power supply check all the power supply connectors connected or not .

It depends. You usually must replace the entire heatsink/fan assembly. If you have the standard 'Intel' heatsink/fan that came with a retail boxed Intel processor, you flip the levers in opposite directions to loosen the assembly, and then you slip a thin piece of metal under each of the four hooks that attach it to the mobo, but you do them one at a time. You just pry a little bit and lift up on each one. After the last hook is freed, you pull the unit completely off the board.

There's also a power connector. Don't forget to unplug it. There are at least 100 different styles of HSF for that mobo. You also want to twist a little to work the thermal-transfer compound loose. Otherwise you might pull the processor out with the HSF.

More than likely it's the memory or video card that is causing the beeps.

When you plug in the power cord is there any lights whatsoever on the laptop, where the plug goes in or on the AC Adapter of the power cord?

When you press the power button do you hear fans running, hard drive spinning, lights on the computer, hear any beeps or lights constantly blinking, hear the DvD/CD drive click and the light on the drawer of the DvD/CD turn on for a second or two? If so the laptop is trying to boot or may have booted, but the screen is not showing for some reason.

Beep tones and blinking lights tells the technicians what is going on with the laptop and why it is not booting. Most times it's a motherboard issue when you hear beeps or blinking lights continuous. Most times the problem is with the memory or Video Card. Count the Blinking Lights or Beeps and take note of their pattern (1 Long or 1 Long followed by 2 Short).

Maybe your power cord is bad if you don't get anything to happen whatsoever when you press the power button. And if that's true maybe you was operating off the battery the last time you had it on and since the power cord is bad, it was not charging the battery so the battery is drained and the power cord is bad.

Maybe you have a Static Charge Buildup. Remove the Power Cord, Remove the Battery, then Press and Hold the power button for 30 seconds. After 30 seconds plug the power cord back in (leave the battery out) and hit the power button to see if it boots. If it does, you can put the battery back in and let it charge.

Maybe your DC Power Jack which is where the power cord plugs into the computer is bad. Take an ink pen and push the tip inside the jack and see if the little pin wiggles, if so the jack is bad. You'll have to take the laptop apart to fix it. Most times it is soldered onto the motherboard, so you will have to desolder the old and solder a new one.

Maybe your memory is bad or the memory slot is bad.

Remove the Power Cord, Open the Case and remove one of the memory chips. Set the chip aside then try rebooting the computer. If it boots, then you know the memory chip you set aside is bad so mark an x on it with an ink pen. If it fails to boot then move the chip to the next memory slot and try rebooting. If it fails take the chip out and set it aside, then put the other chip in and try booting it in both slots. If it boots, just to verify that the chip set aside is bad, mark an x on it and put it into the open memory chip slot and try booting.

Hello Martin,If the CPU fan is faulty and not running the CPU will over heat and shut the computer off as a precautionary measure. If not the CPU would damage itself and not work anymore.You need to run the HP diagnostics on your Desktop to see if it is really the fan that is causing the problem. Go to http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?cc=us&lc=en&dlc=en&softwareitem=pv-25052-2 and download the .iso image. You will need to burn that to a CD/DVD and boot from it. Here are the instructions :http://h10025.www1.hp.com/ewfrf/wc/document?lc=fi&dlc=fi&cc=fi&docname=c00471587If it is the fan and the PC is under warranty, contact HP. If not, you will need to replace it.

Believe it or not, clearing the CMOS might actually help. Make sure you do it right by completely unplug the power cord or turn off the PSU, then take the battery out.

It also sounds like the CPU might be too hot. Look under the fan of the heatsink and see if there is any dust that will block the airflow. When the computer is on, touch the heatsink and feel if it is really warm. If it is really warm, it's a good sign, you might just need more airflow. If it is cold, you might need to reinstall the heatsink/apply new thermal compounds.

Consider the location of the clicks you heard. The hard disk drive (s) are quit close to the power on button. These clicks could point to a bad hard disk drives spindle or a poor wire connection at the power button.
In either case the first question is did your hear your system P.O.S.T.?
Before you lost display! Normally, if the CPU gets too hot two things happen. 1st your hear what sound like a siren from the internal speaker & than the CPU will shut down the system so the CPU doesn't fry. If there is a problem with your power on button, AKA clicking. Check the wires from the button to the motherboard. Make sure their isn't a bad wire. There's only 5v DC running to the power on button. I doupt you'ed even hear a 5volt short.
If you have an OHM meter you can check the on button. You'll need someone to press the power button off & on. Do this with the power supply unpluged. Your checking ohms not volts. If possible check your drive (s) in another system.

Check the memory and/or vga card

click here

this could help you

make sure you have seated all the cards properly, take them out and reseat them including the ram. Make sure your IDE cables are plugged in properly as well.
Restart the computer and if still no post then yes unfortunatly for you its the mobo =(

power suplly problem