Re-connect to internet-long delay

I have a wired connection via a router.
If I turn off my iMac, modem & router for a few hours or more,  I have trouble getting online once again. It usually takes about 15 minutes.  This never happens with PCs running Windows. What am I doing wrong?
Is there a setting or default I need to adjust?
When the iMac boots up I click System Preferences/Network and instead of seeing the usual “Built-in Ethernet Connected” with a green radio button and my IP address displayed, I see all red radio buttons & it has the gray highlight on “External Modem, Not connected.” After a few minutes of nothing happening, I usually click advanced. Then I click “Renew DHCP Lease.” This does nothing. Next, I remember to click “Assist Me.” Then “diagnostics.” I forget exactly what I click on then. I cannot recreate it as I am connected now. I select the Ethernet connection & try to get it to reestablish a connection. Sometimes I get some message about the network changing . Eventually, it finds the network & all is well. I wonder if I had done absolutely nothing but wait 15 minutes if it would resolve. So my main questions are; Do I really need to wait 15 minutes to get back online after the modem, router & computer are all on? If not, what exact procedure an I supposed to follow? What setting do I change so I can be back online is seconds not 15 minutes?
Thanks!

I needed to “Set Service Order” in System Preferences.
Mac uses a sequence of Network Connections as it tries to get online. Mac OS X can maintain MULTIPLE SIMULTANEOUS network connections. (Multihoming)
To set the order:
System Preferences/Network/go to the lower left (sprocket icon) pop up menu -it is just to the right of the + & - signs.
Select “Set service order”
Then you slide the various connections types until you obtain the order you desire. (For me I only have Built in Ethernet so, I made that the top/1st choice.)  Click OK.
Now my iMac doesn't waste a bunch of time attempting to connect via methods that are not set up.
Problem solved.

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