Based on your description of symptoms and steps taken, it seems you may have bricked or soft-bricked your device during flashing the ROM.

Here are some general troubleshooting tips for this situation:

1. Boot into recovery mode: Try holding down specific combinations like Vol Down + Power as soon as you see the logo appear when booting up (the exact combination can vary by phone model, so check online resources). If nothing happens or if it just boots normally again, try different combinations:

- For Samsung phones: Press and hold Volume Up + Home + Power

- For HTC/Motorola phones: Try holding Vol Down + Power then press the volume up/down buttons to enter recovery mode

2. Wipe data and cache: Once in recovery mode (usually denoted by an Android logo with a red exclamation mark or other custom graphics depending on your device), use the Volume Up/Down keys to navigate through options, and select:

- 'wipe user data' / 'factory reset'

- ' wipe cache partition'

3. Reflash the ROM: If step 2 doesn't work (or if you want a fresh start anyway), connect your phone back to your computer via USB using an original cable or one known to be working, then:

- Install and launch any necessary drivers or software for your device

- Follow these general steps:

A. Enable 'USB debugging' on your phone by going into Settings > Developer Options (if not visible, go to About Phone > Build Number, tap it 7 times) > toggle ON

B. Connect your phone in USB mode again and wait until you see a new device appear under Windows Explorer or Mac's Finder

- On Windows: Open 'Device Manager', then find your phone under 'Portable Devices' or 'Other Hardware'

A1. Right-click on it, select Properties

A2. Go to the 'General' tab

* Make sure you see something like 'Android Phone' instead of just a serial number

- On Mac: Open 'Disk Utility', then find your phone's drive under 'External'

C. Press and hold Shift + Volume Up (or whatever combination got you into recovery mode) while connecting the USB cable

* You should now see an option to 'Boot in Recovery Mode'

A1. Connect via USB again

A2. Wait until Windows Explorer or Finder recognizes your phone

D. From here, navigate through options using Volume Up/Down and select:

- 'Recovery Mode'

4. Perform a full factory reset (nuclear option): If all else fails, you can try booting into recovery mode again by holding down the combination specific to your device while simultaneously pressing Power On. Then follow these steps:

1. Use Volume Down/Up keys until you see an 'option' or similar text on screen.

2. Navigate using volume up/down and select with Volume Up.

Warning: This will erase all data, settings, and installed applications! Proceed at your own risk!

If none of these steps work for you (which is possible given the specific nature of phone hardware), it may be worth considering visiting an authorized service center or a professional repair shop to have them diagnose and potentially fix the issue.

Remember that bricking can happen due to various reasons, not just during flashing ROMs. Always back up important data before attempting any advanced operations on your device!

Lg flash tool 2014 tot activation