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No it's not. I can charge through laptop or ac power but the usb icon and the connect to pc menu dosen't appear.Is it totally bricked, i.e. no power connection and no data connection? If so, it's probably best to send it in to be repaired.
Tried other computers. I've ordered an oem cable from ebay, will see if that makes any difference. previously i was using nokia cable to connect to pc.If you get a power connection (via the mains and or PC), make sure you have the HTC device drivers installed on your computer. If you do, first uninstall, then reinstall them on your PC, just in case they've become corrupted. Also, if you haven't already, try connecting with a different USB cable.
The phone is not under warranty. I don't want to get into risk of bricking the phone but is it safe to follow the procedure and by not making any typos fixing the problem? If so, could you please guide me on how to do it? i'll be trying this method after that cable doesn't work. I've tried many nokia and other cables but all don't seem to work.Unless you're happy to have a go using adb (Android Debug Bridge) and Fastboot, you'll find first trying a factory reset and then, if that doesn't work, sending it back to your network provider or HTC to be the quickest way to fix it.
adb and Fastboot involve downloading software to your PC, then running commands from your PC to your phone via the USB. When people report bricked USBs, it's often the case that not all the USB connectivity is bricked, which is why sometimes these things can be fixed with adb. However, if your USB is totally bricked, then adb/Fastboot won't work.
If you choose to go the adb/Fastboot route, either continue in this thread or over at xda-developers.com. Keep in mind that it's possible to brick your phone with adb if you enter the wrong commands or make a typo, which may invalidate your warranty. Only use such tools if and when you're confident to do so.
From the symptoms you describe your phone could be fixed, although it's by no means guaranteed. But, if you're happy trying adb/Fastboot, then it's worth a shot. You'll soon know one way or the other.
If it doesn't work, the other thing people have tried is to flash an RUU (a different or same ROM over the existing one.)
My knowledge of adb/Fastboot is pretty limited, but there are only two commands to use in trying to fix the 'bricked USB' problem, which are straightforward.
To download the software you need, follow this link and read the instructions there.
Once installed and connected to your phone, the commands you need are:
fastboot oem enableqxdm 0
fastboot oem eraseconfig
The first frees up the SD card; the second will reset the 'misc partition'.
As always when doing these kind of things, ensure you have backed-up what you need on your phone.
It's an Android command, so it will work on all Android phones.
However, it may not solve your USB problem, which is why some people then resort to flashing a ROM with an RUU.exe to fix things.
... INFO[ERR] Command error !!!
is it because my phone is not rooted? does this command work on s-on unrooted phone?Yes, very likely because your phone is S-Off. (I thought it might be as your phone isn't under warranty.)
You could try using the Bootloader Unlocker at HTCDev.com to access the system. It won't make your phone 100% S-Off, but it will unlock the recovery, boot and system, meaning the second Fastboot command should then work. If it doesn't, you then have the option to try flashing a ROM, although you should install a recovery mod and root your phone first. (Read all the info on the HTCDev site before unlocking.)
Alternatively, you could try flashing an RUU, instead of using the Bootloader Unlocker.
(Or send it in for repair.)
and on android 2.3.5 it's more cool 
Assuming all is well and you're content with the software you have, and don't want to try custom ROMs, or apps that require root, then you could lock it again. Your phone will also be more secure, although having an anti-virus/malware app should cover things there.
HTC do warn about FOTAs while unlocked - the general rule is not to accept any when your phone is S-Off. So, if you do keep it unlocked, remember that advice.
Thanks for the report. I wonder if it was the 'fastboot' command that was waiting in a queue that fixed things as soon as it could access the system, or if it was solely down to the unlock? Anyway, congrats on fixing your USB-brick problem!