Mac Mini not detecting display....please help

I just bought a mac mini and the plan was to run it through my tv using an HDMI cord. When I go to set things up. I get to the display section in "system preferences" and I started playing around with resolutions to see which would work best with the tv that I have. All the sudden the tv screen went black and now the tv doesn't detect the mac mini through HDMI. After restarting the computer the apple logo would come up and everything would start to boot and then it's like the tv and computer would drop the signal. I don't think that it's something that I done with the resolution.
I checked and seen that this is a common problem, but I don't know how to fix this problem. Any advice is good advice and I really appreciate it.

Will that reset the display options?
David.Austin.Allen wrote:
This is common if in trying new resolutions you hit upon one that is not compatible with your TV.
Restart pressing & holding the Shift key until the gray screen with the spinning cogwheel appears. This is a slower startup as the Mac is running self diagnostics. When the Desktop appears go to System Preferences and reset the resolution to the correct setting. Restart normally.
Dah•veed

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MAC Mini Performance and display quality help needed!

I am new to the mac, having used pcs for what feels like hundreds of years.
I am enjoying the experience, but my MAC mini is so slow. Its a 2014 i5 2.6 Ghz with 8GB of RAM.
For example starting safari takes 20+ seconds from clicking the icon to being able to type a web address.
Also the display is not brilliant the text is blurred. I am using a LG HD Monitor running at 1920 x 1080 and 60 Hz.
I have a Dell PC with very similar specs connected to the same monitor and it does not suffer blurred display.
Thanks for your help

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    Mac mini (Late 2014) (Technical Specifications)
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            4 GB DDR3 1600 MHz ok
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