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Depending on your version of windows, I would trying starting in safe mode to see if the computer does boot. If it does, then you want to restart again, go to advanced boot options and select "start windows with last known good configuration." Access advanced boot options following the steps at this link. Need to Start Windows 7 in Safe Mode Here How
Try booting into safe mode. Chances are that you have set the screen resolution and refresh rate to some value that the LCD cannot handle. That is why it works until Windows takes over. Once you are in Safe Mode you can get things under control.
Apparently your Acer cannot find the operating system. As soon as the Acer logo comes up, there should appear in one of the bottom corners "F" & a number should appear. Immediately start pressing that F number (top row of keyboard). This should take you to a boot screen. Scroll down to boot sequence. Hit enter. Make sure boot-up sequence is CD or floppy drive first, second should be HDD, then escape. Restart computer. Should then boot off CD drive. I am assuming you have an operating system (XP, windows, etc.). Let me know if this doesn't work.
Try tapping F8 when the acer window shows, when it shows the muliboot option, scroll down to "Last Known Good Configuration" and hit enter. If it does not boot normally, you will have to get an external dvd drive and boot off the drive with a windows installation disc to perform a repair.
Well, Firstly this might be a extreme case but is to reformat your hard
drive removing any manufactures partition, and reinstalling the
Operating System, but what i would do first is the go to
start---run---(type this command and hit enter)"msconfig" the system
configuration window should pop up. Go to the boot tab and place check
mark in the box which says "No GUI boot" you mat also change the
timeout seconds there too. hit apply then OK and reboot your system.
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.