Notebook boots up slow then screen goes blank

Try this link, looks like you need to repair boot:
http://h30434.www3.hp.com/t5/Notebook-Lockups-Freezes-Hangs/HP-G72-b66US-Notebook-PC-Dosn-t-Boot-into-Windows/m-p/1336579#M22150

Once you run safe mode. You can turn off the laptop. Then start booting normally.

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

If the system will not boot into safe mode, you will most likely have to reinstall Windows. You can also try the "Last known good configuration" boot option from the F8 boot menu, I find this doesn't work most of the time, but worth a shot. Be sure to back up your data before you reinstall your operating system.

hi,
1.Please keep pressing and releasing F8 key when ACER logo is coming.
2.start the computer in safe mode by selecting it in advanced OS choice menu.
3.If started in safe mode go to programs>accessories>system tools>system restore and restore the system to a back date by selecting a bold previous date in calender.

Idf not booting in safe mode also you may need to reinstall the OS again.

When you turn on your laptop do you see the P.O.S.T screen or it just remains blank? and also while booting up do you get any beep sound?
Try to boot your computer in Safe Mode by Tapping F2 (or Del in few laptops) key after pushing Power Button.
let me know what happens.
Askari :)

Hi there
If you tried in safe mode and still no joy you will have to perform a system recovery with the recovery disk you got with the laptop or the recovery partition, Please be aware that you will loose data.

Good luck

Hi!
Can you go in safe mode? The screen it is working?

In case you don't know how to go in safe mode:

Turn on the computer and after the boot screen press the F8 key.
Windows will ask which mode you like to go:

First try safe mode.

You can also try:
Last know good configuration
VGA mode.

Let me know

Its failing to go through the full boot process. Try pressing F8 on boot until the boot option screen comes up and then select safe mode. Follow this though until you are given the option of using system restore instead of safe mode. take that option by clicking on the NO button. Restore the machine to a date some time a few days previous to the fault developing.

If that fails then put in any OS disc and boot from it. select R at the first options screen, follow it through and then select the C drive option. Just hit enter when asked for admin password.

now type chkdsk /r (copy and paste this to be sure). let it run and then reboot and see what happens

First see if it will boot in the Safe Mode, pressing F8 when the computer starts up. Choose Safe Mode in the boot option. If it will boot in the safe mode. Restart the computer and press F8 again and select Start in the last known configuration. Hopefully
this will fix the problem. If not and you are running XP Pro, boot in the safe mode and do a restore. you get there by clicking Start, Programs, Accessories, System Tools, System Restore, choose a date that the computer was working and click Restore.
BPCS