IMac (2011) white screen for long time before loading

Hello everyone,
When i powered on my iMac yesterday I got the white screen (before the white screen with the grey Apple logo) for a very long time (app. 4-5 min.) before loading the white screen with the grey Apple logo and eventually starting up my dekstop.
Also the wireless bluetooth mouse and keyboard kept on searching for connection, unsuccesfully - so I pluggend in a cabled keyboard and mouse.
So far so good.
I chose to make a clean installation of Mavericks OS X (which was also the current OS X), hoping this would put a end to the long loading time when powering up the computer. However this didn't do any good, and I still get the long loading time with the blank white screen, and no succesfull connection between bluetooth mouse+keyboard and the computer.
Does anyone recognize this issue, and how should I deal with it?
The harddrive is a 1TB SATA, and I never had similar issues with the machine.
The clean install of Mavericks was done after erasing the harddrive, through disc utilities.
I feel very confused about this issue, and can't no longer find any alternative solutions to solve it.
Hoping for your advice and kind help

True :-)
I pressed D upon startup and was able to launch the disc utility.
Tried to Google for people with the same problem, but didnt get any decent answer.
I am thinking some component must be broken, either the HDD or RAM?

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