TV display issue, need to reverse a change?

ianace

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New to the forum, I've bit of a doozy unfortunately:I've a HP windows 7 laptop, it was hooked up to a generic 46" telly, working fine,I was altering the resolution and must have selected one that wasn't compatible with the TV, now when I have my HDMI cable plugged in from the TV nothing displays on the TV and my laptop cycles every 5 seconds or so from a blank screen to a 3 second flash up saying my screen is not at optimal resolution. The laptop works fine with its native display when not hooked up to the TV, is there any way to rollback the change I made? I can't find anything online and there's no option to change display properties on the TV when its not plugged in, tearing my hair out here...:-( Any advice would be greatly appreciated....
 

My Computer My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
HP
OS
windows 7 64bit
CPU
i7
Memory
8 gig
I would try System Restore.
 

My Computer My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Dell Vostro 430
OS
Windows 7 Ultimate x64
CPU
Intel Core I5 750 @ 2.67 GHz
Motherboard
Dell Inc. 054KM3
Memory
DDR3 10GB
Graphics Card(s)
ATI Radeon HD 4350
Monitor(s) Displays
Dell S2740L, Vizio SV470XVT1A
Screen Resolution
1920X1080, 1920X1080
Hard Drives
Western Digital Caviar Black WD5003AZEX, Seagate Barracuda ST31500341AS
Internet Speed
50 Mbps
Antivirus
Microsoft Security Essentials
Browser
Firefox
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