My Laptop's (Inspiron 11/N5050) HDMI port/driver has stopped working.

I had to reformat my laptop due to a virus.

Have tried to get my HDMI to work with my TV (HD Tv) since then and it doesn't work, it's as if it keeps losing the signal/doesn't pick up the signal. Used to work perfectly. (Have tried it on 2 different TV's, and with 2 different working HDMI cables, the TV's pick up the other laptop, but not mine). I have updated all of my drivers, completed the diagnostics on the Dell site. Is there a way to test the actual port?

Need help, please. Any ideas on how to fix this?