Extremely slow startup, Grey and Black screens.

Hey all,
Had my iMac 20" for a couple of weeks now, and have noticed a few recurring problems.
The first one is if I shut down the iMac and then go to turn it on again after a while, it takes a concerning amount of time to even show the apple logo, getting stuck at the grey screen beforehand. I can usually get around this by turning the machine off and starting it again, and I've noticed if I unplug all my USB devices it seems to boot normally.
Second problem is after leaving bootcamp to boot back into OSX, the iMac doesn't boot at all. I get a blank screen, and the light on the front stays lit. I left the machine for 15 mins, nothing happenned. I rebooted around 3-4 times before I got any life - and I'd also pulled out the USB devices.
Hooked to the Belkin USB hub, I have my iPod and 2 USB printers. Hooked directly to my mac, I have 2 external USB hard drives - one is a Maxtor NTFS 300GB Drive, the other a HFS+ 120GB Icybox.
Any idea why this thing boots sporadically? This is nowhere near good enough for a machine that cost me over £1,000.

i'm using bootcamp and i havent had similar problems.
bootcamp is beta.
if i were you, i'd backup what i wanted off the windows partition and then use the Boot Camp Assistant to remove the windows partition, and then reinstall it.
i've found parallels more convienient for everything besides games or anything using DirectX.
hope this helps!

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