Hp probook 4510s won't boot when power botton is pressed the power light will on blink and go off.

On that particular model you need to press the power button nine additional times waiting for the light to Blink 9 times each and then after the 9th time the procedure is as follows... Press the button 4 times hold for seconds on the fifth button push then release for 4 seconds then press the button twice and it should blink 8 times repeat this procedure continuously until the button only lights up once. After the button lights only once then you are ready to place the item into a garbage bag and throw it into the dump

This indicates one of the following:
1. Dead Battery
2. Incompatible Charger
3. Incompatible battery
4. Static Charge Overload - Take out battery, unplug charger, hold power button for 30 seconds, put battery back in, plug in charger and press power.

LB

time to get a new one

The reason you are being prompted for check disk is there might some bad sectors on your disk.
Solution1:If no boot

Boot from the Windows 7 CD and as soon as you get the "Install Now Scree" or the language selection screen press
Shift+F10 and select command prompt from the list of options.

Solution2:If you are able to boot on windows 7

Start-->My Computer --> Right click on C:\-->Properties

Tools ----Error checking -->Check Now.

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, Remove the Battery, Remove the cover that houses the memory on the bottom of the laptop then 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.

When you boot up to the log in screen type in administrator as user to log in if you cant log in

during the boot up process you will see on the screen for a short amount of time press a certain key to enter set up press and hold that key during the boot up process to enter BIOS scroll down to set user password or supervisor password you can change or remove your password from there

also

The most common way that we know on how to reset or clear the BIOS password is to physically remove the power from the computer by disconnecting the power plug and then removing the Cmos battery for 30 minutes from the motherboard. Another way is to reset the clear CMOS jumper on the motherboard itself. Both of the 2 methods mentioned works because most motherboards use a battery to sustain the BIOS/CMOS settings for the motherboards PROM chip. So by cutting off cmos the battery power, the BIOS/CMOS settings will be erased. Hope this helps you

Power drain would be a better solution in this case.
1.first shut down the comp
2.unplug the charger
3. remove the battery
and after press and hold the power button for 60 seconds without any charger and the battery.After the 60 seconds replug the battery and the charger and turn the computer

maybe out of power and the dc jack is broken take the battery out and if the light dose not flash then go chance its the dc jack.

if with out battery still blinks then there's a short on mother board and or video card is bad. but some times taking out that battery will reset the m/b and get it to work if you are lucky

Hi,
When the system boots, press "F8" and get the OS boot options. Select 'Safe Mode' and boot your system.
Search for any errors once it is booted up in safe mode and reboot your PC.
Please come back and vote for me if this turns to be helpful for you. Thnx

Your battery is shot.