My iMac 24" freezes on startup and then works

Hi! My iMac has a startup problem: It freezes on startup around 5-10min and then works again. Sometime the desktop is loaded and sometime it only shows the blue screen. I can move the mouse cursor but the click doesn't work. I backup files with the time machine and reinstall the OS but the problem still exists. I run AHT (extend) and the result is OK, no Hardware problem. Anyone knows how to solve this problem? Thanks in advance. TW

More issues since I last posted:
It's running, very poorly, but am trying to upload an MP3 to soundcloud.com and the upload keeps freezing. It's nothing to do with my Internet connection either.
Quite honestly I think my iMac is on its last legs
I really need this running as smoothly as quickly as possible as my partner has recently been made redundant and needs the mac so she can look for jobs. This is very inconvenient :/

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