NEED HELP! Toshiba laptop HDMI to LCD HDTV PROBLEM!

Hello,

I have a toshiba laptop (ATI RADEON HD5145 graphics) and 32" LG LCD tv. Bought a HDMI cable couple of days ago, plugged it in tv, plugged it in laptop (nothing else to do) and it worked just fine for a couple of times. Yesterday tried to do the same thing and it didn't work. On the TV screen (HDMI output) just says "no signal]". Tried this:

1. Change the HDMI port on tv (there are two of them) - nothing.
2. Check the driver - it's up to date
3. Do all things i've found on forums (display settings, Fn+ F5 pressing, duplicate screen when connecting to a projector etc...) - nothing.
4. Read TV user manual - nothing
5. Connect my laptop on another tv with the same cable, work just fine, so I assume cable is ok, and hdmi port on computer is ok.

How to fix this problem, please help, I don't know what else to try.

Thanks in advance.