[Q] [Desire keys not working, bad flash a rom] topic

Hi, i have a problem. I flashed a custom rom (CM 11). After installation, the phone constantly rebooted, so I wanted to install another rom. And here is a problem. Volume keys on my desire not working. And if I want to connect my phone to my computer and displays " Device Not Recognized " . I tried to install all drivers ( HTC DRIVERS , ADB) and still nothing . Please, can you help me ? Is there any possibility to get rom in the phone?

THX A LOT! =)