Q: iMac (late-2012) cannot detect DELL U2515H external monitor

Hi there,

I have iMac late 2012. I tried connecting it to my Dell U2515H monitor via thunderbolt-DisplayPort cable. It did not work. Monitor cannot detect signal at all. TechSpec of my iMac tells me it supports 30 inch with max resolution 2560X1560 top.

The monitor works fine connecting to my rMBP 2013. can somebody help.

thanks!

iMac, macOS Sierra (10.12)

Posted on Oct 17, 2016 5:38 AM

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Q: iMac (late-2012) cannot detect DELL U2515H external monitor

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by den.thed,

den.thed Oct 17, 2016 9:22 AM in response to Yurimeng
Level 7 (27,755 points)

Oct 17, 2016 9:22 AM in response to Yurimeng

Reset the SMC and NVRAM
Reset the System Management Controller (SMC) on your Mac - Apple Support
How to Reset NVRAM on your Mac - Apple Support

For more info see
Use multiple displays with your Mac - Apple Support
and
Get help with video issues on external displays connected to your Mac - Apple Support
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by Yurimeng,

Yurimeng Oct 17, 2016 8:10 PM in response to den.thed
Level 1 (8 points)

Desktops

Oct 17, 2016 8:10 PM in response to den.thed

Actually I rest both of them TWICE with no luck. There is nothing at all in system information Thunderbolt category therefore i have to bring it to apple store.
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Q: iMac (late-2012) cannot detect DELL U2515H external monitor

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by den.thed,

by Yurimeng,

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