Screen goes white

If hitting it seems to remedy the problem, I would say you probably have a loose cable somewhere. Either the Video Cable that is at the top behind the screen is loose or the LCD Inverter at the bottom of the screen (has 2 cable in it) is loose.

The connector that plugs in the LCD panel has got loose with time. You must open the lid of the laptop, access the LCD panel and reseat all connectors and contacts on it = no new parts needed.

you could try windows media player as default it works for me

When the screen glows grey/white, it means that the T-CON board is bad or it is not getting the 5vdc from the logic board. or loose conection on the T-CON board which is part of the LCD panel assembly.
Does it look like this when it goes out? Checkto see if the 5vdc goes away when it goes out, the 5vdc is supplied through the switched transistor on the logic board..
http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/

u need a new phone i ahda similar problem with my lg kp500

Go to www.acer.com, choose Service and Support, choose Driver Download, choose Drivers & Downloads, select Product Line Notebook, select Aspire 4315, click Search.

The above should get you to here :
http://www.acerpanam.com/synapse/forms/portal20.cfm?website=AcerPanAm.com&siteid=7117&areaid=2&formid=3394#results

Click on "Flash BIOS v1.13 " which is the latest BIOS for the 4315.

Follow the instructions to download and extract the files.

In order to Run the Vv2-113.exe file, you will need to right-click on it and choose "Run as administrator"

Make sure your battery is fully charged before updating a BIOS and do NOT power off the laptop during the update process.

This seems to have fixed most of the white screen problems on the 4315 that I am working on. The Fn-F4 "standby" and power button (or FN key) "resume" process described earlier is worth remembering because I have still had a couple of the white screens with the latest BIOS. Both times seemed to be when the screen saver was trying to start (lots better than during the boot-up!), so I have changed from the Acer default screen saver to something simpler hoping that the change makes the problem less frequent.

Sounds like to me the set has some cold solder joints or fractures that are changing with temperture and can be fixed possibly. Are you located locally to me? i may be able to assist with the repair of your unit. Let me know and good luck. Jay

My screen goes blank from time to time and when I turn it off and turn it back on again, it seems to re-boot itself and is fine. However, I have never had this problem with any other phone and fear my phone may be dying. It is only 1 year old and worked fine for the first 8 months I had it. But the blank screen seems to happen more frequently lately. I don't think I will buy and LG again.

Bad solder connection in the horizontal pincussion circuit.have someone resolder.God luck.4tune

Check to see that the monitor cable is correctly installed. Also, make sure you have the most up-to-date drivers installed for your graphics adaptor card(both ATI and Nvidia carry catch-all driver programs to keep you up to date.) Tighten the cable screws of course, to make sure the monitor cable isnt just wiggling in its seating.