FLASH OF WHITE SCREEN

UNPLUGGED MAC ONE WEEK AGO.
PLUGGED BACK IN TODAY.
CLICK ON USER ID - ENTER PASSWORD - FLASH OF WHITE SCREEN - BACK TO USER IDS.
ANY IDEAS?
INTERNET SIGNAL STRONG. TIME CAPSULE PLUGGED IN,
THANK YOU!

Please do not type in all caps, it is considered shouting and we can hear you just fine.
The first thing to try is attempt to reset the SMC and PRAM. If you don't know how please click iMac SMC and PRAM reset

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