My compaq laptop turned on after few seconds turned off it is (no display observed). laptop starts or its power light starts after pressing F10 button but no display on screen ocurs

Why did you flash the bios? Did you flash it with an upgraded bios that you downloaded from the HP Compaq site for your model and your operating system? When you turn on the laptop immediately start hitting the F8 Key repeatedly to see if it shows you the SAFE Mode option. If so select Safe Mode and see if it boots.

Are there any blinking lights or beeps? This is very strange. Try removing the battery and the power cord, then press and hold the power button for 30 seconds. After 30 seconds plug the power cord back in (leave the battery out) and see if it boots. If it does you had a static buildup in the laptop and you released it by holding the power button for 30 seconds. If it boots, put the battery back in.

if all fails you can try to see if your system will go into System Recovery when you press the Power Button immediately hit the F10 or F11 keys repeatedly. If so you can set your system back to the way it was when your purchased it. That means you will lose all your data, documents, music, pictures and videos.

all that matters is the screen,
is the battery out now,
is the screen 100% black, turned on, no text ever?
yes, then press the F10 key at power on, hammer
it, F10 see BIOS screens?
try new power pack
fan spins. blows air, does the cd eject work ,yes and yes.
does an external screen work on the VGA jack
is the back lamps burned out. CCFL
point a flash light at the screen , see data., turned on
there, that is a start.

Hi.

1. Turn on the computer. When the Compaq logo displays, press F10. Or,
2. During Power On Self Test (POST), and after the memory check completes, press F10 as soon as you see a small white square flashing on the top right corner of the screen.
3. In the computer setup, use the right arrow to move the selection to the Advanced menu.
4. Use the down arrow to move the selection down to Boot options, and press Enter. The Boot options menu pops up with four boot order options.
5. Use the down arrow to move the selection.
6. Press the left arrow to change the order of Notebook.
7. Press F10 to accept the change.
8. Press ESC to jump back File menu, and then move the selection down to "Save changes and exit".
9. Press Enter. If asked to save changes and exit, press F10.

On some laptops you can change the boot order by tapping the F12 key as the computer starts up.



Regards.

o open the BIOS Setup screen:

1. Turn off the computer and wait five seconds.
2. Turn on the computer.
3. When the first screen displays, immediately press the F10 key if your computer was built in 2006 or later (came with Vista or Windows 7). Press the F1 key if your computer was built before 2006 (XP or earlier). Press the key once every second until a BIOS Setup utility screen opens.
   NOTE: On some Compaq Presario computers (before 2002), press the F10 key at the logo screen.
4. Use the keyboard to move through the menus.
5. Then disable the Administrator PAsssword
   

Hi

On startup can you not go back and reverse what you have done in bios to see if that corrects the problem

so press power button and straight away press F10 or delete a few times as it is starting up and hopefully put the setting back in bios save it which i think is F10 and exit or restart

good luck

1. Press the Power button to start the computer.
   NOTE: Pressing F10 opens the BIOS of Compaq Presario desktops 2001 and earlier.Pressing F1 opens the BIOS of the S3000 series, 6400 series, and 2002 models of Presario desktop computers.
2. Immediately press the F10 or F1 key repeatedly on the keyboard when the logo screen displays.

Hi,

1. Turn off computer and unplug power cord.
2. Disconnect all external devices(open up the computer tower and then )
3. remove battery
4. press power button and hold for 10-15 seconds
5. plug power cord back into computer and press power button.
6. Check LED’s and listen for power supply fan.
7. If LED’s are on or power supply fan starts spinning, watch for boot screen
8. If coputer begins to turn on, turn it off.
9. Reconnect battery and external devices.
10. Press power button and make sure computer starts.

This should work....all the best

1. If the notebook computer is running solely on battery power, plug the AC adapter into the notebook.
2. Shut down the computer if it is running.
3. Press the power button to turn on the computer.
4. Press f10 when the HP/Compaq logo displays.
5. After the BIOS Setup Utility displays, use the Right Arrow key to select the Diagnostics menu.
6. Select HDD Self-Test options .
7. Press enter to display a list of HDD/Self-Test options.
8. Select Notebook Hard Drive and then press f10 to display an Estimated test time .
9. Press f10 to continue. The Hard Drive Self Test executes a Quick test , a Comprehensive test, and a SMART test.
If test reports pass then perform installation of OS
else hard drive has gone bad

Normally during the early start sequence (when the laptop displays the Compaq logo), you will need to press F9, F10 or F11 repeatedly (model varies)
Some also require you to hold the key down before you press the power button, then release it after the laptop has finished displaying the Compaq logo.
Hope that helps.
If you are still lost, post back.
Peter

Hi, On some Compaq models, entry to CMOS/BIOS setup requires pressing F10 as soon as the cursor (white box) appears in the upper right hand corner of the screen (The cursor is displayed on the screen for about two seconds. If you do not press F10 during this time, you must restart the computer and try again.); Alternately on some other models, it is at boot when you see the "Compaq" log in big letters. hope this be of some help/idea. Post back how things turned up or should you need further information. Good luck and kind regards.