HT2452 startup takes 5 minutes now from gray screen to desk top, cursor wont move

i mac on start up gray screen for 3 minutes, then desk top comes up, cursor wont move

Heat.... dust... dead/dying graphic card...
4 yrs, original equipment
Monitor the system's temperature readings, open it up.
Your RAM will have a layer of dust on it, they attract dust, run very very hot.
Boost the fan speed.
Keep the case where it gets cool air and vented but no direct sun.
Pull the video card. The X1900 was a huge dust magnet and would clog and kill itself if you don't pull it out and get the dust out.
List the general hardware, too, from System Profiler but exclude the serial no.

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