In the last couple of days images in my Outlook mail and other places do not open. Some of the dashboard images don’t open now, (weather e.g.). Also app store auto updates will not work. Message says Network connection lost. Don’t recall doing any t

System Preferences>Network. Select your connection in the left column. Click on the "Assist Me" button. In the next window click on the "Diagnostic" button. Advise of the report.

Your iMac connected through ethernet?

TomJay wrote:

All checked OK. I can receive mail, just the images don't open, just that little blue square with the question mark.

Repair permissions and restart your computer. If that does not work, do the following:

Run OS Recovery

Disconnect all devices from your computer except for the keyboard & mouse.

Boot up from your computer by holding down the command+r keys. This will take you to the recovery drive.

Select Disk Utility & hit Return.

In Disk Utility select the HD on the left & click on Repair Disk (bottom right).

When you reach the desktop after doing the above, again repair permissions & restart your computer.

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Which app are you using to open the images?

Suffix/type of the image files?

Open up a test account to see if the problem shows up there. This is to rule out system wide problem.

And/or download theOS X Yosemite 10.10.3 Combo Update, repair permissions and restart your computer after the installation.

How are you connected to the internet?

It appears you are having two different type of problems. Images & network. Hopefully, a knowledgeable user(s) will chime in here.

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If you are still under warranty and/or have AppleCare, call them. Let them deal w/it.

OOW: Take your Mac to your local Apple Store or an AASP. Diagnostic testing is FREE!

Other OOW options:

How to save money on Mac repairs with your credit card’s extended warranty

TomJay wrote:

Comcast to Comcast box to Airport. WiFi from there.

As you can see, I can access the web and send & receive email.

Connect your iMac to the ethernet. Same problem(s)?

Message says Network connection lost.

When I tried to open Firefox or Safari it said the server connection was lost.

Something is going on w/your network. I just don't know what? As for your images problem, I have run out of ideas. Sorry. 😕

What does Wireless Diagnostics show?

Wi-Fi Problems in OS X Yosemite (2)

Wi-Fi Problems in OS X Yosemite (3)

WiFi Potential Temporary fix - Yosemite

Also try turning off Bluetooth.

WIFI AND BLUETOOTH FINALLY SOLVED, NO REALLY - YOSEMITE 10.10

Your welcome. Sorry I wasn't more helpful. Please keep us up to date on what the Apple Store techs tell you and/or find out.

So the HD was the culprit all along! Glad to hear everything is working as expected.

Thank you for reporting back. Much appreciated.