Problem connecting external monitor on VGA port

I've had a Dell SP2309W connected to my Thinkpad W530 running Windows 8 Pro since I got it without a problem.
A couple of days ago I disconnected the monitor to plug it in to another computer to do something; after returning the monitor, it is no longer recognised as a SP2309W, but a "Generic non-pnp monitor". This is causing problems with my resolution. I only had the monitor unplugged for 30mins.
I've reinstalled the drivers for the monitor and the Nvidia adapter. It's a K1000M.
Any ideas?

BIOS settings are as follows:
Boot display device: Thinkpad LCD
Graphics Device: Nvidia Optimus
OS detection for Nvidia Optmus: disabled
I haven't chagned these settings.

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The computer always identifies the screen correctly, so it looks like there is communication from the screen to the PC, but not the other way round.
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I already did:
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Hello and thank you for the tips,
I did try the options you suggested unfortunately with no success.
I actually got myself HDMI cable and this connection is working perfectly well. Luckily the very screen I want to attach my laptop to does have HDMI port. It is just a bit annoying to know that the d-sub port seems to be useless.
The lady from Toshiba tech support call centre suggested either OS re-install or sending it to Toshiba for repair/check as it is still under warranty. None of this options suites me at the moment, so I will probably stick to the HDMI. Still, I have a feeling it is a software rather than hardware problem.
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VGA Port stuck on connected external monitor.

Lenovo G580, Win. 8.1 with all updates.VGA Port stuck on connected external monitor.Connected to external monitor via vga; "duplecate", "extend", and "second screen only" all works fine.When I return to default PC screen it too works fine; however, if I unplug the vga cable the default screen goes black.I tried restarting but it did not fix. Defult screen will only work if vga is pluged in.Any soloutions?

Hi JohnD7,
Welcom to Lenovo Community Forums!
Make sure that the Main LCD isused as the main LCD.
Open Screen resolution page
1. In the first box select your Main LCD
2. A Box below should appear, Place a check in Make this
hit Apply and try unplugging your external VGA
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Cheers!
Solid Cruver

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How connect External monitor to iMac?

How to do that depends on the iMac variant you have. iMacs have been in continuous production since 1998 in four broad families that are not 100 percent alike in behavior.
Please look at the iMac images and descriptions in the links on this site:
http://www.everymac.com/systems/apple/imac/index-imac.html
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Hello @RedWingFan,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I have read your post on how your desktop computer is not able to display two independent images, and I would be happy to assist you in this matter!
To ensure your displays are configured correctly, I recommend following the steps in this document on Using Two or More Monitors with One Computer (Windows 8).
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Regards
MechPilot
I work on behalf of HP
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the right to say “Thanks” for helping!

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Hi there BrianYip,
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I recently had to have the logic board in my mbp replaced and was wondering if disconnecting an external monitor while computer is on would cause the problem.
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Hi
For resolving the mentioned issue , Please try the following
1. Update the Bios to latest version
http://support.lenovo.com/en_US/downloads/detail.page?DocID=DS014992
2. Update the Display Video drivers
http://support.lenovo.com/en_US/research/hints-or-tips/detail.page?&DocID=HT063249
After updating drivers press Fn + F7 to toggle from internal to External Monitor
I hope this helps

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Whats up Apple Fam,
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Resolution Recommended and supported
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1280 x 1024 @ 60, 75 Hz
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640 x 480 @ 60, 75 Hz
720 x 400 @ 70 Hz
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Not sure.
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Problem connecting external monitor on VGA port

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