Imac won't boot with new hard drive installed

So I installed a new 1Tb caviar black in my PPC G5 Imac, but when I turn the computer on, I get no video, no startup chime, nothing. The power light does come on, and fans start running after a minute or so, but thats it. I can't boot from the install disc.
The computer boots up as expected when I remove the drive(startup chime, grey screen, missing folder icon).
Any suggestions to what the problem is? Any help would be greatly appreciated.
-D

wierd i have similar problem. I removed HDD after crash to backup in an enclosure before reinstalling os again, put the hdd back and connected the hdd sensor backup (although i thought it was a knock sensor..doh!) . Mac wouldnt start, no screen, no chime, nada, but sleep light stays on. With PCs this usually mean CPU fault so i removed RAM to see if could get a BEEP meaning CPU is ok as it spots ram. No beep. So after checking everything i stripped out ram, hdd, airport and battery and reset PMU, tried again and now i get beep!! so cpu works. slowly adding everything back in and trying power up, last thing to go in was hdd sensor and sure enough when this is connected i reproduce the symptoms. So i disconnected the sensor and tried and i get chimes etc... Ive inspected the cable and made sure is connected right way up and still cant get to work. So it seems sensor is goosed! Debating wether to replace just yet

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