Problems with screen resolution after connecting to HDTV with HDMI

Hope that somebody can help with this.
For a while I was connecting my iMac to my HDTV with a HDMI cable and a Mini Displayport Adaptor and had no problems.
The other day when I decided to put the sound through the TV (it was a quiet recording) and switched off the mirror mode my screen on the iMac went very strange.
The left of the screen was very skewed with strange colours and the actual wallpaper and icons was only on the right-hand side of the screen (I couldn't see the time, some icons, etc). The mouse pointer wouldn't go onto the left-hand side of the screen.
I have updated the software and when I now restart it - the resolution is incorrect and I cannot see the entire screen without scrolling across (although the strange stuff on the left-hand side isn't there). Whenever I now connect to the HDTV (using mirror screen) I get the same problem again.
Any help would be appreciated as I am fairly new to Macs.

Do you mean the screen looks like it's zoomed in ? If so then double-tap with three fingers to zoom out, and then make sure that Settings > General > Accessibility > Zoom is switched 'off'

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Product Name: HP Pavilion dv6 Notebook PC
Product Number: A6X94UA#ABA
BIOS: F.1C
Processor: Intel Core i7-2670QM
Graphics Device: Intel HD Graphics Family
I recently had to wipe my laptop and reinstall Windows 7 Home Premium (created restore disk from Windows). Ever since, I have not been able to adjust my display settings any higher than 1024x768. My only other option on the adjustment range is 800x600. I have updated BIOS (it was already at latest version) and I have searched for updated drivers (system says most recent ones are in use), but I cannot get it to provide me with a more appropriate size selection for my screen; I have to scroll back and forth in Internet Explorer, for example, to see a full screen because it doesn't fit correctly on my laptop screen.
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Teri

@buzymom2 ,
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HP Pavilion dv6-6c53cl Entertainment Notebook PC Drivers
Once you have them downloaded save them to a USB memory stick or burn them to a CD or DVD.
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Entering Safe Mode (Windows 7)
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Once you have the drivers removed, reboot into windows in normal mode. Now install your drivers one at a time you have to start with the chipset driver. If you install the drivers without the chipset first it can cause all kinds of problems.
Let me know how things go.
Thank you so much for posting and have a great day.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
D5GR
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