Hi there, I have a 2 week old iMac 27", i7, 2tb Hard Drive, 16gb RM In the second week the boot up times became very slow. I would turn the machine on and get the chime within 5 seconds or so. Then just a black/blank screen. Eventually after about 10mins I would get a white screen then it would boot up normally. Now the machine just doesn't get to the white screen. So I get the chime and then just darkness. It does sound like the machine is on (usual quiet imac whirring). I've tried various key commands when I turn the machine on including pressing C with the install disk in the dvd drive and the alt, control, P, R pram reset. I've also tried unplugging all the cables, leaving the machine for a minute and switching back on. I did manage to perform the PRAM reset once. I reset the machine and it booted fine. But now when I switch it on just darkness. I've called after sales and will try to get the machine replaced but in the meantime is there anything I could try that might make the machine work? I need to do a remix this weekend (deadline Monday) so really need to get it working. Help!