Imac g5 20 isight wont boot up

hi
first of all sorry about my english.
OK i bought an imac g5 20 isight second hand from ebay  2.1ghz (ppc) /1 gig of ram /250 gb maxtor apple hdd everything looks clean ,and proper.
The computer turns ON but does not boot  a system , all i have the GREY screen   with NO  apple logo  and NO  turning weel .after about 40 sec the blinking interogation come up.
i reset the pram by switching  off the power ,and turnit it on againg ->hold command/option/p/r  until shimed twice  ->restet -nvram ->set-defaults ->reset-all  NO LUCK
i tried to connect it to the another mac (imac g5 17 ) via firewire by holding t key of the sick imac but the  hard drive icon  does not show up in the other working imac.i do not have the original retail dvd (black one) to try installing or even repairing the disk via disk utility ,i ve tried grey  disk 10.4.6 which i had
but they did not help i could not get the apple test hardware because holding shift /hlding v/holding s does not working , i suspect the  hdd .i know i will need
a retail disk .
any ideas what do you think thanks for help.

If the seller proclaimed that he/she was selling a working computer, strongly suggest that you get your money back.  You don't know what could be wrong nor the real condition of the computer.
Macs are not suppose to be sold w/o the system DVDs that originally came w/the computer. You will need to obtain them from the seller.  System DVDs are machine specific and cannot be used from one computer to another.  You also need them for troubleshooting as one of them comes w/the Hardware Test. 
You can get replacement System Install & Restore CD/DVDs from Apple's Customer Support - in the US, (800) 767-2775 - for a nominal S&H fee. You'll need to have the model and/or serial number of your Mac available. 
If you're not in the US, you may need to go through the regional Apple Store that serves your location to find the contact number. Here's a list of links to all of those - http://store.apple.com/Catalog/US/Images/intlstoreroutingpage.html  Another resource:  International Support Phone #s.

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                   2%          EtreCheck
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              119 MB          com.apple.IconServicesAgent
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              1.59 GB          Active RAM
              1.25 GB          Inactive RAM
              813 MB          Wired RAM
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