Colour on my screen is blotchy, mottled.

SOURCE: On aa acer aspire one colours on screen get mixed

try right clicking on the desktop an go to graphic properties and go to color corrections then just move stuff around until it look right

SOURCE: I've got an Acer Aspire

This is a defect in the LCD panel itself - the layers of the screen are starting to get squished one on top of each other . This is done by the air pressure , heating the laptop locally lowers that and the screen goes back to normal.
The problem is unfixable and it's only gonna go worse. You need to replace the LCD screen of the laptop. The only place you will find it for sure is a Acer service shop so take your laptop to one.

SOURCE: my Acer D250 netbook starts

Suggest using Acer eRecovery Management to attempt problem resolution as follows...
1. begin with the D250 powered off ...
2. if present, remove any external monitor (unplug its VGA connector from D250 left side)
3. power on and immediately press F2 to enter the BIOS / setup utility
4. using the right cursor key, cursor over to the Main tab of the InsydeH20 Setup Utility
5. if D2D Recovery is not enabled, cursor down to it, press Enter key and enable in pop-up
6. save any changes by pressing F10 to save and exit, otherwise press Esc to just exit
7. press Alt and F10 together while the Acer logo is showing to get entry into eRecovery.
8. eRecovery entry is indicated by message at bottom of screen "Windows is loading files...".
9. if not successful, power off, wait a minute then power on again and immediately
10. press Alt and F10 at the same time - do this several times while Acer logo showing.
11. once in Acer eRecovery Management (V7.0.10) screen, just leave it there........
12. if after a day or so, the screen has not changed, the problem is likely NOT hardware.
13. on the other hand, if your screen problem occurs after awhile, then it is hardware.
14. if it is not hardware, then your Operating System is likely corrupt or has a virus.
15. If it is not a hardware problem, you can completely restore system to factory defaults.
16. board level hardware repairs best done by sending D250 to Acer's authorized shops.

SOURCE: I have an Acer 6920 laptop, for some reason the

i have an aspire 4520 laptop and it's been a long time I never used it because the keyboard is broken. One day try to open it and the screen was white or sometimes blurs. what should i do?

SOURCE: band of darker good quality colour at top quarter

Try having your colour depth at 32 bit, right click on your desktop and goto graphics properties and select 32 bit instead of 16bit