I don't remember reading about loading screens going green anywhere before - but just to check a few things that usually help us on GBATemp to try & determine actual faults
Firstly FYI a warning - there's been a LOT of bad 2.1 cards that have trouble with loading/saving so there's the possibility that you may have one. There's apparently a rumour that an offical Acekard update will be release soon that'll fix the dodgy 2.1 cards - but nothing offical (yet). Even if it comes out there's still the possibility you have a damaged card
- There is also apparently 'fake' cards - If you can run AKAIO press [Start] > 'Help' & post the 'HW:' number - this sometimes help determine if you have a clone card
Some games 'lock-up' on starting if you have 'Soft-reset' and/or 'cheats' enabled - so have you tried running games with these swithed off
Have you backup, reformatted the microSD card, & reinstalled AKAIO ?? - somtime a bad sector on the card can cause problems
What about other files like homebrew,music,txt etc - do they work OK ? (You may need to install Moonshell to check some of these files)
Does it work with older version of AKAIO (e.g 1.5.1) or the official Acekard firmware ??
Sorry for all the questions - but the more info we on GBATemp get the more we could help
EDITED: uh Oh... Just popped over to AKAIO Forums - there's someone there that having similar problem as you
http://www.normmatt.com/forum/viewtopic.php?f=3&t=347 & it seems that 'clone' cards end up @ the 'green screen' after the Loading comes up
Since you've just brought the card - I suggest you get back at the sellers complaining about being sold a 'clone' and not a proper Acekard 2.1
Can you post the HW number of your card anyway - just to check