My desire dsn't detects my sd card... & a lot more worse.

Hi all,

I have recently flashed my Desire with Cyanogenmod 7 (bad idea) since then i hav the following problems.

1 - My device it doesn't detects sd card.. (tried changing multiple cards)
2 - i am not able to start recovery mode as i used to do it earlier.
3 - my PC doesn't detects my phone wen connected via. usb.

I tried to do system wipe through terminal , bt didn't work ( Read only files )

Please Help,,,,,Please....