Acer 7720 will not boot

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

Safe Mode and System Restore can fix startup issues in an Acer Aspire One, but if the computer won't even load the boot screen, the problem could be related to the basic input/output system (BIOS).
The Acer Aspire One 110 and 150 are two models that can have BIOS-related problems that prevent the computer from booting.
You can upgrade the BIOS through a USB flash drive to repair this issue.
If you are able boot past the startup screen, but can't sign in to Windows, you can use Windows Advanced Boot Options to bypass startup problems.

Go to the Acer website (see Below).
http://us.acer.com/ac/en/US/content/drivers
Click "Support," then select "Download" from the menu on the left.
Select "Netbook" as the product family.
Click "Aspire One" as the product line. Select "AOA110" or "AOA150" as the product model.


Click the "BIOS" tab.
Click the download button and save the file to the desktop.


Go to the desktop when the download completes.
Double-click the file to open it.


Drag-and-drop the folder to the desktop.
Double-click the folder to open its contents in Windows Explorer.


Double-click the "BIOS_Acer_3310_A_AOA110 & AOA150" folder.
Double-click the "Dos_Flash" folder.


Insert a blank USB flash drive into a USB slot.
Drag-and-drop the "3310.fd" and "Flashit.exe" files to the flash drive.


Right-click the "3310.fd" file. Click "Rename."
Change the file name to "zg5ia32.fd" and press "Enter."


Connect the AC adapter to the power jack.
Hold down "Fn" and "Esc" with one hand, then press the power button with the other.


Release the "Fn" and "Esc" keys when the power indicator light comes on.
Wait at least seven minutes for the system to fix the BIOS and repair the Acer Aspire One startup issues.
The computer will restart automatically when the process is complete.

Other Models

Turn on the computer.
Press "F8" before the Windows logo appears to access the Windows Advanced Boot Options menu.


Scroll to Last-Known Good Configuration.
Press "Enter" to load Windows.
If the OS fails to start up, hold down the power button for 10 seconds to turn off the computer.


Press the power button to turn the Acer Aspire One back on. Press "F8," then select "Safe Mode" from the options.


Log in to Safe Mode. Click "Start," "All Programs," "System Tools" and then "System Restore." Click "Next."


Select the last working restore point from the options. Click "Next."
Click "Finish" to run System Restore and recover the Acer Aspire One to a previous state.

Hello and Welcome to FixYa,

Seems like you are having a boot issue on your computer. One of the things that you can try is to boot in safe mode and see if you can clear up startup items. Here's How :

1. Shut the computer down
   
2. Boot to safe mode by tapping on "F8" key as soon as you turn on your computer
3. Choose "Safe mode only" and wait till it completely boot
4. Click on start and click "run"
5. Type "msconfig" and hit "Ok" - a window should pop up.
6. Find and Click on "startup" tab and uncheck everything
7. Hit "Apply" and choose to restart the computer

If the above steps cannot be completed or did not resolve the problem, then the Operating system has to be fully reinstalled. You can visit Acer's support site for more information on how to fully reinstall your operating system. I have to warn you that doing this will erase all information/data stored in your hard drive :

Acer Support

Thank you for using FixYa.

I run into this all the time, thank you microsoft!
First, shut it down and take a break, make sure you power the computer completely down to a cold boot. Walk away for ten, fifteen minutes.
Then when you come back boot into your setup (bios) screen, to do this is different for each manufacturer, some require you to hit del, some F2, some F10... when you get there Change your boot order to anything other than what it currently is, and save it. Reboot. let windows try to start. if it does, great! If not, reboot and Go BACK to the setup screen and change your boot order BACK to what you NEED/WANT it to be and save again and reboot. This SHOULD take you back to a windows startup of either a repair or safe startup screen. DO NOT REPAIR! Boot normally. The updates lost a startup configuration that is written INTERNALLY to windows. Since you altered the hardware configuration by changing the boot sequence around, windows had to rewrite this and away you go. On a laptop it gets a bit more confusing as you have to do this without the battery in place or it will continually write the data to the hard drive under the laptops auto powerdown/save features that a desktop does not have. NOTE: if this does not work any other bios change other than clock/calander will force this dmi configuration change. but typically the boot sequence is the safest to alter, as you do not risk messing up critical setting with this one.

Start the Acer in Safe Mode. Let it settle on the desktop, so that it is ready to be used. Then check the screen's settings, using right-click on a blank spot on the desktop. See if you can get it out of the limited video mode in which it seems to be now.
Or simply shut it down again, and restart back into normal mode.
Frequently, this is all it takes to reset the video.

Good luck,
-a.

Try booting to "Safe Mode" (tapping the "F8" key on boot), or however you can get to your Desktop, click start, right click "My Computer", select "Properties", then "Advanced" tab, then click the "Settings" button under "Startup and Recovery", then uncheck "Automatically restart" under "System Failure", click "OK" then "OK" again and restart your PC.

That should allow you to run without the instant restarting on BSOD, so you can repair/remove Mcafee.

off course it is repairable dont worry look try to install OS thru the following procedure to factory default state

Acer: When you first turn on the laptop and see the Acer logo screen, hold the ALT key and press the F10 key (you need to do this before the Acer logo disappears).

if it installs the OS ok then fine if not

pls consider changing RAM take out from beneath the laptop open the cover all screws and take out the L shaped panel then u will see the RAM in front with 2 chips one uper and one lower side try to take out both and then re fit only one in the upper slot and then try to install if hangs again , then try the 2nd chip in the first slot and repeat the procedure if it works ok only try both chips one by one if it resolves ur issue and u find the faulty one replace it with new one with sam specs

in the last case if ur system still hangs then my friend ur hard disk is giving u hard time it needs replacement

when a system boots after bios loading all that is trf from Hdisk to RAM and then OS is loaded if one have problem system will hang or freeze try these solutions and then tell me the results

pls go step by step

and pls rate me fixya if i fixed ur problem

kindly let me know abt it and tell me in detail the messages u get and the system behaviour

Try booting the system to Safe mode.

To boot to safe mode:
Restart the computer. As soon as the BIOS has finished loading, keep tapping on F8 key on your keyboard. When the Windows Options menu appears select the "Safe mode" then press Enter.

Once you managed to boot to Safe mode, change the computer startup and recovery settings by right-clicking "My Computer" then select Properties. Select Advanced tab. Under Startup and Recovery, click Settings. Uncheck the box for "Automatically restart" under System Failure.

Reboot again normally, see if it will reboot again by itself. If you managed to make the system boot normally, proceed to Events Viewer to find out what is the caused.

If the system failed to boot normally after doing the above, you might want to boot the system to "Last known good configuration"

plz check the powersupply

You may have a video resolution selected on your computer that the screen doesn't support.

The reason you see the the initial startup message is because that is loaded from the bios, prior to the settings for the graphic card output being loaded.

Try booting the computer in safe mode and adjusting the display resolution.