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you can go to the BIOS setting? if you can,look for "Boot Device Priority" or something like that,it's usually placed on Advanced settings. Set the first boot device as your harddisk,save the settings and restart your computer Please let me know if it's working or not
Try resetting the RAM module, it may not be making proper connection. Remove the RAM module and connect it again. If the laptop still does not boot up, the RAM module may be faulty, remove the RAM module and take it to your friendly computer repair shop and get them to test the RAM module for you.
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.