Imac G5 no boot

so while trying make old imac g5 run little faster deleted bunch of files. stupid , did not know of them were. turned off computer , not boot. have tried inserting retail mac osx install disk 10.5.6 , sounds trying read sits @ apple logo screen spinny thing while goes blue screen , nothing. there way fix computer?

edit: has gone grey screen spinning beach ball , still sounds trying read disk. , if dont use install disk turn on , says bunch of words on screen like
panic(cpu: unable find driver platform: "powermac8,1".

latest stack backtrace cpu 0:

, lot more.

 

i think have figured out problem. instal disk require 512mb of ram amd imac has 256mb. need buy new stick of memory , install it, boot disc.

 

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