I have a hp 89810-001 laptop motherboard.

First - re-seat the hard disk and reboot the computer. If the computer does not boot up then reboot and go into the BIOS configuration to see if the BIOS detects the hard drive. If it doesn't detect the hard drive then it could be faulty.
Then the hard drive needs to be replaced in the computer/laptop, Windows installed and the computer or laptop's device drivers plus your programs etc. to get a functioning computer/laptop again.

Return to tech that installed Mobo.

Building a computer will require: a motherboard, a processor, memory, a video card or motherboard with onboard video, a sound card or motherboard with onboard sound, at least one hard drive, a CD or DVD drive, a case for the computer components, a power supply, fans to cool the computer, an operating system, a monitor, speakers, keyboard, mouse, 2-3 hours to assemble the computer.
You must ensure that all of the components are compatible with one another. After receiving the parts, lay everything out on a large, clean surface. Make sure you are grounded by touching a metal surface; this will prevent the transfer of static electricity to your computer components.
Typically, the steps to install the components are as follows: 1. mount the power supply in the case, 2. mount the motherboard 3. lock the processor in the socket on the motherboard 4. insert the memory sticks into the slots on the motherboard 5. mount the processor fan on the processor 6. insert the video card into the applicable slot on the motherboard 7. insert the hard drive into a hard drive bay in the case, 8. insert the CD drive into a CD drive bay, 9. mount any fans you have to the fan cutouts on the case 10. connect all applicable data cables to the CD and hard drives 11. connect all applicable power cables to the motherboard, video card, processor, hard drive, CD drive, and any other components. 12. connect the front panel USB, power, lights, and reset connectors to the motherboard 13. close the case 14. connect the power, monitor, speakers, keyboard, and mouse to the computer
Because this process is rather involved, I recommend following a guide such as this one: http://www.maximumpc.com/article/how-tos/how-_build_silent_gaming_pc
It details the process, includes pictures, and even provides a list of compatible parts.

One bad/faulty lead can cause a computer with lots of problems
replace all the leads that attach to your hard drive including electrical extensions + IDE,SATA the ones that attach from your motherboard to hard drive
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty or just replace them they are probably old and faulty ?
hope this helps

Start taking your laptop apart piece by piece and test it after each removed component:
1. Remove the hard drive and test the laptop.
2. Remove the DVD drive and test the laptop.
3. Remove the wireless card and test the laptop.
4. Unplug the display panel from the motherboard/video card and test the laptop.
etc....
Continue taking it apart until you have only three major components connected: motherboard (with video card), processor, and memory. If you still experience the same problem, most likely it's bad motherboard.
By the way, before you start, try reconnecting the memory module. If you have two modules installed, try removing them one by one and test the laptop with each one separately

Start taking your laptop apart piece by piece and test it after each removed component:
1. Remove the hard drive and test the laptop.
2. Remove the DVD drive and test the laptop.
3. Remove the wireless card and test the laptop.
4. Unplug the display panel from the motherboard/video card and test the laptop.
etc....
Continue taking it apart until you have only three major components connected: motherboard (with video card), processor, and memory. If you still experience the same problem, most likely it's bad motherboard.
By the way, before you start, try reconnecting the memory module. If you have two modules installed, try removing them one by one and test the laptop with each one separately.

Start taking your laptop apart piece by piece and test it after each removed component:
1. Remove the hard drive and test the laptop.
2. Remove the DVD drive and test the laptop.
3. Remove the wireless card and test the laptop.
4. Unplug the display panel from the motherboard/video card and test the laptop.
etc....
Continue taking it apart until you have only three major components connected: motherboard (with video card), processor, and memory. If you still experience the same problem, most likely it's bad motherboard.
By the way, before you start, try reconnecting the memory module. If you have two modules installed, try removing them one by one and test the laptop with each one separately

These are the reasons why your pc wont switch on

1. Defective power adapter
2. Defective Processor
3. Defective Motherboard
Note: If you replaced your motherboard check the specs on the previous motherboard it should be the same part number or a replacement part number.

You can purchase your motherboard to HP System Board HP Motherboard

Here's a sample video

In addition to your power supply, your motherboard was also probably affected by the surge. Most surges do damage beyond the motherboard. The power supply is still supplying power to it, which is why the fan runs and power lights come on, but it probably isn't doing much more then that. You might want to start looking for a motherboard replacement. The best and most inexpensive place is www.tigerdirect.com.

Somethings has happened to your motherboard, CPU and/or hard drive somewhere along the line if it wont power up when you hit the power button and this would explain the reason for no activity. When a motherboard fails, no activity will happen at all, so Im putting my money on your motherboard being defect so take it in for a service and you may have to buy a new laptop since repairs can be costly.