Lumia 710
1. How dead is your phone:
Does it vibrate when you hold the on/off button?
No
If not: leave your phone on the originale charger (with the supplied cable) for 8 to 10 hours and try again.
Done, Still nothing
Does it vibrate when you hold the volume-down+power+camer button?
No
Are you able to enter the Qualcomm mode?
No
2. Details about the flashing process
What operating system did you use to flash your phone?
If you are running Linux and you are able to enter Qualcomm mode connect your Lumia in Qualcomm mode. Create a list of the lumias partitions (fdisk -l) and include it in your post.
Do you remember the command you used to flash the phone?
Sometimes you can Access the previous commands on the command prompt by pressing the up-arrow on your keyboard
Do you remember the output of the dd command?
What ROM did you flash?
Did you perform a hardreset after flashing?
I was using Windows 8, but have Linux Also.
I completed the steps in vova1609 's thread: How to upgrade to Nokia DLOAD
it was all fine I did what it said on the thread mentioned above unplugged from me computer and the phone went off straight away and hasn't come back on since.
I don't if the battery has been completely drained when I've been following them steps and it hasn't charged while its been plugged into the computer and as soon as i've unplugged it its gone off and hasn't got enough power to tell the phone to charge as that happend to Lumia's before Nokia did the battery fix
3. Additional info:
Do you have a Nokia Care Point or carrier store nearby?
Nearest One is about an hour on the train away
Did you create dumps/backups of the partitions before flashing the ROM?
Did't get that far but no
Have you ever used NCS or some other tools to flash firmware to the device?
No, but I have used NCS many times when I had a Lumia 800 with no problem