I have an HP Compaq 8510P Laptop which will not boot.

The power light comes on. The charge indicator light blinks 7 times then the entire system turns off. There is no fan noise, nothing displays on the screen. I'm pretty sure that the blinking 7 times is a diagnostic code but I have no idea where to get the codes. Any help would be greatly appreciated. Just powered it on again and the charge light (the lightning bolt icon) quickly blinks amber 7 times, then blinks green then blinks amber 1 more time.
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Danny ChildIT ManagerCommented:
try booting with the battery removed, but with the mains connected.  
Danny ChildIT ManagerCommented:
I'd also try with the hard disk or additional sticks of RAM removed too, just to simplify the hardware issues.  I'm not seeing any info online for diagnostic flashes.  Have you called HP?

ncfbhelpdesk1Author Commented:
Thanks for the replies. I've tried booting it without the battery and just the power cord. It did the same thing. I also tried to remove one memory stick and I even tried brand new working memory and same thing.
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Disconnect the power from the computer and remove battery keep it aside. Disconnect all external devices connected to the computer.

Also remove all the RAM in the slots of the notebook.
Power on with AC  supply, do hear the beeps ?

If you hear nothing, it could mean motherboard and or CPU faulty.
Beeps indicates ---> on your motherboard and CPU are not an issue.

In the event that there is an issue with the AC adapter the above test should also
be done with either a good AC adapter or a good battery.

If you hear beeps, insert back 1 RAM at a time module and test.

here my laptop troubleshooting guide :
- if no display - test with an external monitor
- test also with a known good battery !
- remove battery and AC adaptor, hold power button for 20 sec, connect AC and reboot --> any display ? if NO -->
- disconnect all disk and cd drives, battery , and other cards and peripherals, leave only 1 ram stick
- boot -->any display ?
- if NO remove all ram and reboot --> if NO beeps, mobo or cpu bad ; if it beeps, replace ram stick

for troubleshooting the display (LCD) problems :  http://www.lcdparts.net/howto/troubleshooting/troubleshootingLaptop.aspx      LCD troubleshooting

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ncfbhelpdesk1Author Commented:
I don't hear any beeps. All I see is the light blinking. Also, it might help if I added the fact that it was working fine until one day, it was dropped from the car seat to the ground (about 2-3 ft.) That's when it quit powering on. I already took it apart completely and didn't notice anything out of the ordinary with the exception of a small crack on the bottom plastic case. It does have a separate ATI graphics card. It's not integrated list most other laptops so that can be replaced. I don't mind replacing the motherboard, the video card or the processor. I just want to know which part is bad so I don't waste money.
Check if any thing in the laptop has been dislodged.
Since the laptop dropped , there could be possible damage to MB and to the LCD.

The fact that you dont hear the beeps its indication that MB or CPU is fautly.
Can you also remove the graphics card out and test if you can get the beeps.

If you have a similar set you could swap over parts and test. You would be able to verify
the faulty part.

In a fall its possible to cause damage to the LCD also.
There are far too many suspected parts and it may be a little risky buying and replacing the MB.
It may get costly to replace the CPU, MB and or  the LCD.

did you follow my post?
ncfbhelpdesk1Author Commented:
Yes nobus, I did follow your post and based on what you've wrote, it appears that the motherboard is shot. I hear no beeps whatsoever. Well, thanks guys. I think I'll just sell it for parts since it's probably not worth putting in $200 for a new motherboard in my opinion.
i posted : mobo or cpu - you cannot tell without testing with a known good one which is bad
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