Periodic blank screen

2 Solutions Possible.
The connection between the LCD Screen to the motherboard is not connected well and is causing the issues you are having.
OR.
The screen itself needs to be replaced because it defective.

there is a tiny button that turns off the screen when the notebook is running with the lid closed sometimes they may stick, check this

You can buy the parts to fix these on Ebay. There are two components. 1 is the light source itself. (Very fragile)
The other component is the the power inverter for the light. Both have a history of going bad. They have to be removed to be tested. Probably better to replace both as a set.

Please vist the link below to determine if the computer has bluetooth


http://support.acer.com/acerpanam/notebook/0000/Acer/Aspire1300/Aspire1300faq37.shtml

You need to find right drivers for your laptop .
search on google as " windows drivers for acer travel mate 5520 " if you do not know how to install drivers let me know .
scan you system with an anit virus as well

Most likely the inverter module for the lcd screen has failed. If you can hook up your laptop to an external monitor, you will be able to make sure that the rest of the laptop sill functions.

An inverter is a inexpensive part, $10-15 dollars, but requires that the lid be disassembled somewhat to install it

Hi you can try this in Vista

1. Click Start, and then type cmd in the Start Search box.
2. In the search results list, right-click Command Prompt or Cmd, and then click Run as Administrator on the pop up contextual menu.
3. If you are prompted by User Account Control for permission, click Continue.
4. At the command prompt, type the following command, and then press ENTER: powercfg.exe -h off
   
5. Type exit, and then press ENTER.

Windows Xp;
Click Start, click Control Panel, click Performance and Maintenance, and then click Power Options. click the Hibernate tab and unckeck the box and turnoff monitor should be never

Try without battery.
If it set the problem, let me know

Check power supply if green led lights up
if not try other power supply if yes
Tell me if you ear or see anything on the screen.

Test the laptop with a external monitor see if you get any picture on the external if the external screen remains white then most likely the mainboard or the video adapter (in most cases build into the mainboard) is failing or has failed. One Possible reason could be overheating damage (the unit may not be overheating right now during the 20 seconds, it may have suffered earlier).

It could also be a poor connection between the display and the mainboard. but if the screen works for 20 seconds and then goes white its probably not the issue.

If the external screen works without any problems the issue is most likely your lcd screen or one of the boards inside.

If you are in warranty get in touch with your dealer or acer.
If you are outside of warranty get in touch with acer or a local repairer / acer cervice center.

Thanks,
Ekse

it could be a vga driver fault check the driver in device manager.
if the device can not start, uninstall the driver and reinstall.
ONLY DO THIS IF YOU HAVE THE ORIGINAL DRIVERS!