S3 9300 bootloop and not reconised by pc HELP PLZ? - Galaxy S III Q&A, Help & Troubleshooting

hi all first im sorry for my english
i have s3 gti 9300 just bootoop in Samsung logo
so when i try to flash rom and when i go to dowbload mod i have these (power reset or unknown upload mode) i don't know what is that ????????
but if i try many time i can accesse to download mode
the probleme is that when i plug the usb in pc he don't reconize the s3 and i have these (device descriptor request failed)
and befor it connect with pc without problem,,,, and i have other sumsung tha connect without probleme
so i think the driver or cable are not the probleme
i can accsesse to recovery but there is not install zip to install rom from sd card
any help plz

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