Laptop not recognizing 2nd monitor U410

Ever since my windows 8.1 upgrade (?) My laptop has not recognised any external monitor through my HDMI port.
Upon drive installation it will work but after a reboot i am in the same position again and have to re-install the graphics driver.
my ideapad is U410.
It Worked fine (with regard to graphics) at Windows 8.0 problems started after upgrade to 8.1
My connector on the Idea pad is HDMI whilst the connector on the monitor is DVI (i have tried two different cables both give the same result.
If anyone has any advice i would greatly appreciate it.

So, I need to you to try a couple of things first before we figure out the actual problem.
1. Connect the cable to your second display and navigate to Control Panel.
2. Click on Display and Then on Change Display Settings.
Q - Do you see your laptop display and the external display listed there?
If Yes, then select the external display, set the resolution and Click Ok.
(Whether you want to duplicate displays or use either one is up to you)
You can also click Identify to verify that both displays are being identified correctly.
If No, then click on Detect (if its enabled) and see if the other monitor shows up.
Let me know if anything works. We can further investigate your issue.
Also, Are you saying that your graphics drivers get Uninstalled (or corrupted), everytime you reboot?
How about your other drivers, such as audio, peripherals?
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