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if u leave ur pc running for a few hours and u still see the same screen do a hard power down then reboot ur pc into to safe mode by press F8 as the manufacture logo disappear now after u boot into safe mode windows will finish the update r do a roll back automatically. if u weren't able to boot into to safe mode enter recovery mode and use a system restore to get back into ur system.
press fn button and with up-arrow increase brightness ,,, in windows open display settings by right clicking on the desktop (intel or nvidia properties ) acer 4320 could have nvidia or intel ... increase the brightness and the contrast or load the default settings ,,, use external monitor if need ...
as I asked in the clarification I am assuming that this is a laptop either way I will need to know the model of the computer. If it's a desktop PC I need to know the model of the Monitor. Here is a solution if it's a laptop:The inverter of the screen to the laptop be going bad. I came to this conclusion by the fact you say that the monitor will stay on until it gets to your desktop start. Does the screen flicker or did this happen gradually? Get back to me and I'll try to help figure this out.
Load windows in safe mode by pressing F8 once it starts to load and selecting the 'safe mode' option. Once inside windows change your desktop resolution to something like 800X600 to keep it safe. Shut down and boot up properly, should load your desktop.
start your machine...when the sony screen disappears press F8 (to get safe mode options) one of these options is a vista startup repair....choose that one.....takes a couple of minutes to fix and boot into windows so be patient....the reason you have this problem is the user profile has become corrupt but windows vista corrects this with startup repair
You can press F8 repeatedly while booting to get the Boot options screen. It should contain a VGA Mode - this will boot your regular desktop with a lower resolution. Once in windows adjust the screen resolution to one that your Monitor supports.
Right click the desktop anywhere. Choose properties. Go to the right most tab "settings". Slide the screen resolution option until its where you want it. Click Apply. Do Not Hit any keys on the keyboard. Wait until it finishes changing resolution than click Ok. Close the Window.
If your screen goes black during this waiting 30 seconds should automatically revert it to the previous settings.