My O2 Atom on normal mode binks in blue colour and there is a missed call or sms blinks in orange (or red). from yesterday it blinks in green on normal mode. Can you please tell me why? Anything wrong?

SOURCE: O2 xDA Atom Exec Screen Blank After SofReset

Couple of things you can try to fix the issue, firstly try a hard reset

To perform a hard reset, use the stylus while pressing into the reset hole, press the power on/off button at the same time. Screen will prompt you to press the Green call and Red end call button together to confirm on hard resetting the device. *Note: Hard resetting the device will cause the device to be reset back to its original factory default settings and all data will be lost

Try that and if it doesnt resolve the issue then we can try another solution

SOURCE: While charging my O2 atom exec, the LED (Flash light) does not glow red ?

go to USB connection in settings, unclick enhanced network functionality box..  

SOURCE: My O2 Atom life got dead bootloader.

I'm not using an Atom Life, so I don't have the flashing files for your device. But I think these links will help you a lot for understanding the process. First link is exactly for your device, I got it translated from russion to english by google, second is from a very good source, xda-developers. And the last one is not Atom Life but it is close so the pictures can help. You'll also need a JTAG cable. I hope this helps. (Because the only other solution than this is replacing your mainboard which will cost you around $300-$400) (http://translate.google.com/translate?prev=hp&hl=en&js=n&u=http://pda2u.ru/forum/topic338.html&sl=ru&tl=en) (http://forum.xda-developers.com/showthread.php?t=336278) (http://xdaflameusers.com/viewtopic.php?id=703)

SOURCE: Turning on WIFI on O2 atom

go to network n check for wireless network.n try to search

SOURCE: how to file transfer from O2 atom to Sony Ericsson

what kind of phone is it?