Harddisk icon at startup; whats wrong?

At the last few weeks my Mac mini (mid 2007) displays sometimes a harddisk icon after pressing the powerup button. This is know as the Startup Manager, and also displayed when the option key is hold during boot. It happens with Leopard as well with Snow Leopard installed. I did the follow actions to solve this, but all negative, someone help please!
1. Redefine the startup disk in System Preferences (again and again..)
2. Checking hardware with Onyx and Apple Hardware Test: no problems
3. Resetting the PRAM: time, date and soundlevel are saved well, so battery is ok(?) The startup disk also is saved in the PRAM.
4. Resetting the SMC
5. Replace harddrive
Maybe something is wrong with the Apple keyboard or USB ports, so the mini receives an Option-key event at boot? Or there is an invisible person in the room pressing the the key..

Now you say something. At the end of the year I bought a new Eizo monitor, and from that time the issue appears. Today I replaced the PRAM battery cell and yesterday I boot wihtout a keyboard; the issue is still there. A new thing I discovered is that the icon appears when the system is powered off for a longer time. I want to find out the specific time.
The Eizo monitor than is in standby automatically, because there is no signal from the mini. When I power up the mini, the Eizo has to come out of standby mode, maybe they are 'missing' each other sometimes?!

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