Sony Ericsson V630i won't start

Here is my problem. The other night I turned off my phone to change the battery and charge it (I have two batteries, one of them was empty so I wanted to charge it) and since then my phone doesn't want to start. I just get red light flashing when pressing the power button.
I have found a thread on this forum when someone had the same problem with the same phone - I wanted to reply there, but it was closed, here is the link: Sony Ericsson V630i wont turn on!!! - Top Sony Forums
Then I tried to download the upgrade program from official Sony Ericsson site, but it didn't work - I did all that it asked (fully charged the battery with another phone coz it says the battery has to be fully charged, I tried it with SIM card and without it, with memory card and without it), and when it said I had to press the C button, I did and hold it for a long time but nothing happened, so I couldn't go on because the computer didn't recognize that the phone was plugged in USB.
Any idea what should I do, is there any combination code that I could press and might help or something else I could do?
Any ideas and comments are welcome, thanks in advance for any help.

Must Repair EROM read here: http://www.topsony.com/forum/post2-p92462.html

Thanks for the info. Which SeTool do I need? I downloaded SeTool 2, but I don't see the "Identify" button. Here is the picture of the SeTool I have: http://img196.imageshack.us/img196/4092/42545032.jpg
Is it the right one?

http://img196.imageshack.us/img196/4092/42545032.jpg

You must use Setool2lite 1.11 !!!

I see. Where can I get it? The last 10 I tried to download from different sites had viruses and my computer didn't allow me to download them. Is this a program you need to pay for?

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Originally Posted by alekta

I see. Where can I get it? The last 10 I tried to download from different sites had viruses and my computer didn't allow me to download them. Is this a program you need to pay for?

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Download from here: Setool2lite111.rar

First you must uninstall antivirus program - No virus on Setool2lite111!
Then you can start it normal.

i registered becase of the same prblem. thanks for all the help, it worked fine for me.
i read this
[TUTORIAL] REPAIRING EROM GUIDES for most sonyericsson phones
and the link above.
just alittle bit confused with the download section of the site but ok.
thanks guys!!