my galaxy ace doesn't get recognised by my HP laptop with USB connection. When i tried to connect it with my friends cable on his DELL laptop, it notified CONNECTION UNSUCCESSFUL - NO DRIVER FOUND. my phone still gets charged though. when i tried *#7284# solution , it wrote
DIAG CONFIG
[1]USB[*]
[2]UART[]
[3]DBG MSG ON[]
[4]DBG MSG OFF[*]

i selected [1]USB[*] it gave me
USB_Diag Selected
Change Complete.
IF you change Uart or USB diag
Please reboot the mobile.

I'm not able to find MODEM->PDA mode...
PLEase HELP