Boot and Reliability Problem

Greetings,
In August 2008 I bought my first Mac and ever since have trouble with it. I already contacted Apple Support, Sonnet Support, Lacie Support, still there is no solution on the table.
I thought, before I have the maschine picked up I give it a shot in these fora.
My configuration:
Mac Pro 3.0Ghz, 16 Gig, 4x 750 Gig HD internal, 3x 1TB external (Time capsule, 2x Lacie quadra), Sonnet E4P.
My main problems:
1. Noise level:
The maschine emits a humming noise, intervalling up and down, probably located where the PSU is installed (decibel meter check). The noise is clearly audble, even over the AHT noise of the fans speeding up. The resonance can be felt if a hand is put on the chassis.
I asked friends with similiar maschines, and none of them reports this extremly annoying hum. I checked the HD sleds, all sits tight.
I assume this is only able to be resolved by sending the maschine to service.
2. Boot and Reliability Problems:
If my Mac is out over night, and on booting it up in the morning, it takes around 6-7 minutes until boot cycle is complete. If I am not mistaken, this should be more in the region of 30 seconds.
Up until recently, after boot OSX did not find a harddrive, but I solved this, the reason was that the useless dealer I bought it from formatted one internal drive as MS-DOS FAT, go figure.
However, I need to run a RAID-0 via OSX, and will exchange the WD Caviar SE for WD 1TB RE3 for that purpose. I am also having trouble with my xternal Lacie Drives on Sonnet E4P, but I send system logs and reports to Sonnet still waiting on their answer.
Would it be correct to assume that less than one minute is a more appropriate boot up time?
Does anyone else around here have this noise problem I described?
Best wishes
OVS

Good evening The Hatter,
yeah, I studied a couple of those threads and tried to apply findings. Tell me, you say you have your MCP on the side, does that not cause problems for the DVD drive and/or other parts. The MCP does not look as if it is designed to lay on it's side.
I tried to de couple the chassis from the floor with heavy carpet underlay, still the same. I am not fuzzy, but this sound is really disturbing in a quiet environment, and I often need it quiet when I work on photographs. I left the case open, I pushed the lever half way up, nothing resolved that.
Allow me to ask you something else, you seem to have a lot of Mac years under your belt, would you think my boot problems can come from a dodgy OSX installation? The dealer I bought it from in August installed everything, but has proven to be rather incompetent and very sloppy. The first few weeks, on 10.54, I had probably 8-10 kernel crashes, which stopped after 10.5.5 and so far only occurs when I use sleep mode, hence I can;t use it anymore.
The pain in the butt is that I probably would be best advised to do a complete clean install, hence have to authorise all my software again. - Sigh - I intend to wait with that until i received new HD's.
Best wishes
OVS

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