Press the power button hard to switch off. On the Tab again, what do you see if you cannot reboot successfully ?
And provide details what you id - what rom were you tryin g to flash ?
Did you run Chainfire bootloader check and patch if to ensure you can flash other roms ?

Respect you that you go and flash without learning the basics
Can you go to download mode ? Press vol down and power button simultaneously . You will see android mascot with downloading shown
If so flash rotohammer JME please refer page 1 on ron flashing for details. This will revive your tab
After successful reboot run chainfire bootloader again refer page 1 for how n where. Then only you flash overcome

If you cannot go to downloadmode you have to send in to service centre as is bricked

you just need to read the guide properly... dont miss out anything.... not even one simple step... and all will be fine...

If you want to flash ver 2.0 and above - use JPZ. this is clearly written in the guide - did you read it ??

It is also written in the guide what is important have at least 3 GB free space in your INTERNAL SD card NOT external card. The external card is not important and not necessary unless you want to copy the 2.0 rom zip file onto it to flash. Copying the rom 2.0 zip into the internal SD card will be OK too.

You MUST check and PATCH the bootloaders ( if you are prompted that is not safe to flash) - just select the big PATCH button shown: it is compulsory step. Don't do it and you risk bricking your Tab. EVERY Rom developer will warn you flashing anything is at YOUR OWN RISK - don't blame them if anything goes wrong - is a standard statement. If you are worry over all these caution statements - DON'T FLASH anything

Repeat again - READ and READ again the manual written by pitbull. He has put in tons of effort , follow all his steps diligently and you will not screwup. If you do, just blame yourself for not reading properly. His steps are already step by step and not necessary to ask for step-by-step again .

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Added on June 5, 2011, 7:34 pm
Can I know what website you are trying to access ? You mean yesterday you manage to visit the site but today unable to ???
Why don't you try to clear all your web cache and try again ?

I think u should check connection issue to.  .
Cause not every where got 3

Oh, in my excitement with OC2.0.1 I didn't read his previous posts properly. Ha, sometimes it's good to use ODIN and go back to stock. The safe-stock v3 is also an ODIN-based solution.

Good to know all is well now..

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Added on June 15, 2011, 3:26 pm

Have you read the installation guide on the OC home page?

If you're already on Overcome GB - beta or rc or gold, you should just flash the non-wipe zipfile via CWM/recovery. Don't forget to wipe the caches (cache & dalvik cache) first.

Yes