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Does you have Windows 8 Installed? If Yes, then you installed a cracked version of Windows 8 which caused the problem. Buy The Original One which will solve the problem Or Else Please Mention The Device Name and Specs You have problem with.
If the system will not complete boot, try the F8 boot menu and select safe mode and see if the system will boot to windows.
If the system boots to windows, you could have software issues or a startup item causing the system to hang at boot, try turning off the startup group items in MSCONFIG (Start, run, MSCONFIG) and see if the system will boot in normal mode.
If that is not help, hold the Fn Key while pressing the power buttong this should start PSA diagnostics on the system, see if any hardware fails
Step 1: Shut down your PC completely. Step 2: Turn on the Power button. Step 3: As soon as you turn it on start hitting the F8 key on your keyboard until you get to a black screen called "Windows Advanced option". (If you don't get to that that screen but you end up reaching the blue screen than that means you have delayed in hitting the F8 key. start again from step 1.) Step 4: As soon as you reach "Windows Advanced option" use your down arrow keys to choose an option called "Last know good configuration". Step 5: Select that and HIT ENTER.
This is usually a problem associated with NOD32 or Cisco software conflicting with drivers or other software. If you can get past the grey screen even once, uninstall the software and reboot. If you can't get past the grey screen at all, then you might have to completely reinstall windows :(.
I'd look for professional hands-on help in this case if you're not comfortable doing this.
I would try the following: 1. Remove the battery completely. If the computer boots properly several times in a row, then the battery may be causing the power supply to do strange things. 2. If you have experience removing laptop components, try removing the hard drive. Because you say the screen goes black (I assume the system powers off) sometimes after the HP logo, I doubt its Windows or a software issue. 3. If HP has a diagnostic CD you can boot to, try that. 4. It may be the power supply acting up. If it charges the battery, and if you can boot to Windows with the battery, try getting a new power supply. 5. Otherwise, it may be the motherboard of the laptop.