When i turn on my computer hp dv2000 i only hear 1 long beep followed by 2 short beeps..but theres no display.

Common solutions for issues that cause blinking LEDs or beep tones
Check for loose connections and test the memory
Blink codes are often displayed after a user adds memory to the computer but does not seat the module properly. The LEDs may also blink error codes if a hardware component is loose because the computer was dropped or jarred. Some HP Notebook PCs come with one stick of memory but have two memory slots. The problem could be that the stick of memory or one of the memory slots has a bad connection.
The memory module compartment on most notebooks is located on the bottom of the case. The exact position varies by model. However, on some models, the memory compartment is under the keyboard. See your User Guide for the exact location of memory modules on your notebook.
NOTE: Removing and reseating memory modules requires the use of tools and the partial disassembly of the computer. If you do not feel comfortable doing this work yourself, take the computer to an authorized retailer for technical service.
Check for loose memory modules
If a memory module is loose or is not making good contact with the memory slots, the computer does not recognize all of the memory. Reseating the memory module may resolve memory failure errors. To reseat the memory module, take the memory module out of the memory slot and then put it back into the slot to get a better connection so that the computer can recognize the memory.
The memory module compartment on most notebooks is located on the bottom of the case, however, on some models, the memory compartment is under the keyboard. See your User Guide for the exact location of memory modules on your notebook.
Use the following steps to remove and reseat the memory modules:
Step 1 - Remove the electrical power
To remove all power from the computer and prevent accidental damage to the electronic components, do the following:Turn off the computer by pressing and holding down the Power button for about 30 seconds. Unplug the AC adaptor from the notebook.Slide and hold the battery release latch to the unlock position.Use your finger to lift the battery up and out.
Step 2 - Remove the memory module
Remove the memory module cover on the bottom of the notebook.1 - Loosen the compartment's retention screws2 - Lift up and remove the memory compartment coverRemove the memory modules from the memory slots.1 - Pull the retention clips away from sides of the memory module2 - Gently pull the module out of the memory module slotCAUTION: To prevent damage to the memory module, grasp the memory module by the side edges. Do not touch the metal contacts.
Reseat the memory module by holding module at a 45-degree angle, and pressing it firmly into the memory slot until it is seated.1 - Align the notched edge of the module with the tab in the slot.2 - Firmly press the module into the slot. 3 - Pivot top edge of memory module downward until retention clips snap into place.After reseating the memory module, replace the cover over the memory compartment before restarting the computer.1 - Align the cover tabs2 - Tighten the memory compartment cover screws
Step 3 - Replace the electrical power
When troubleshooting problems, use only the AC power to perform the tests. After the problem is resolved, you can turn off the computer and insert the battery into the notebook. Plus the connection from the AC adapter into the notebook, and then connect the AC adapter to a working power supply.Perform any tests to verify the computer can startup and run in the Windows operating system.With the computer turned off, push the battery into the base enclosure until the retention clips click into position.
If the computer can access part of the memory, it may be possible to access the BIOS Setup Utility display and perform a memory self test to identify other memory issues. If the computer cannot boot to the BIOS Utility, try removing and reseating the memory and the hard drive, and then repeat the following steps to perform the memory self test.
1.Plug the AC adapter into the computer.
1.Turn off the computer.
1.Press the Power button to start the computer and repeatedly press the f10 key to enter the BIOS Setup menu.
1.In the BIOS Setup Utility, use the Right Arrow or Left Arrow keys to navigate through the menu selection to locate the Diagnostics .
1.Use the Down Arrow or Up Arrow keys to select Memory Test .
1.Press Enter , and then Yes to perform memory test.
1.After test completes, press f10 key to Save and Exit , and then press Enter key to Exit Saving Changes? .
If the test fails, one or more of the memory modules may not be seated properly. Check for and reseat loose memory modules.
What to do when the computer starts into Windows normally
After you have completed the troubleshooting process and your computer has booted normally into the Windows operating system, you should:Run HP Assistant to update HP software and drivers. Run Windows Update to update operating system and software.Run anti-virus program to remove any virus.