after installing mavericks apple id is greyed out in app store when trying to update iPhoto

Is an Apple ID shown that you don't recognize? Did you buy the computer new or used?

You installed a hacked app, originally from the Mac App Store. It contains the receipt for a different app, downloaded using an account that you don't control. You need to identify and remove the hacked app.

Important: The app you need to remove is not necessarily the one named in the App Store alert. For example, the App Store may prompt you to update "Angry Birds" or "Twitter," but the hacked app may be something else entirely. Don't make any assumptions about which app you're looking for. To find it, you must carry out a systematic search with Spotlight.

1. Triple-click anywhere in the line of text below on this page to select it:

kMDItemAppStoreHasReceipt=1

Copy the selected text to the Clipboard by pressing the key combination command-C.

2. In the Finder, press command-F to open a search window, or select

File ▹ Find

from the menu bar. In the search window, select

Search: This Mac

from the row of tokens below the toolbar. Below that is a popup menu of search criteria, initially showing Kind. From that menu, select

Other...

A sheet will drop down. In that sheet, select

Raw Query

as the criterion, then click OK or press return.

Now there will be a text box to the right of the menu of search criteria. That's where you enter the raw search query. Click in that box and paste the text you copied earlier by pressing command-V.

4. The search window will now show all the App Store products that are installed. Compare those search results with the list of your purchases from the App Store. To see the complete list, you may need to unhide hidden purchases. If any apps were download from the App Store using other Apple ID accounts that you control, sign in to the store under each of those ID's and check the purchases.

At least one of the apps in the Spotlight search results is not among your purchases in the App Store. Move each such item to the Trash, after quitting it if it's running. You may be prompted for your administrator password. Empty the Trash.

Quit and relaunch the App Store. Test.

If you find these instructions confusing, ask for an alternative method.

These instructions may be easier to follow.

Please triple-click anywhere in the line below on this page to select it:

echo QlpoOTFBWSZTWQI/KZYAACh/kn/KSgSCYGADbWL4Qbtu3rAgADAAIAB1FU2T1QwTIwAEaDNAAJjQNUn5E1P1TINNMjQNBkAAaAfqlBIbwBMUzMlrqglam16IRVr0kt9JveHETcdXMddYnOjuI2BDedjgv1LjUWYu2ne3DINwH/F2EMYaxctxaEJz6mH6zSBfiBGsC/Y6UhmccDiDHUzwfo2vyKHzFkKmff/F3JFOFCQAj8plgA== | base64 -D | bunzip2 > Desktop/Apps.savedSearch; clear

Copy the selected text to the Clipboard by pressing the key combination command-C.

Launch the built-in Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.

Paste into the Terminal window by pressing the key combination command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.

You can then quit Terminal. There should now be an icon that looks like a folder on the Desktop, with the name "Apps.savedSearch". It's a Smart Folder. Double-click it. A search window will open. Continue from step 4 in my previous comment.

When you're done, you can delete the smart folder. Nothing else will be deleted.

If iPhoto was upgraded or accepted with a different Apple ID, you won't be able to update it. Delete it and repurchase it.

Please post a screenshot that shows what you mean. Be careful not to include any private information.

Start a reply to this message. Click the camera icon in the toolbar of the editing window and select the image file to upload it. You can also include text in the reply.

Sign out of the App Store and sign back in. If there's no change, then either you missed a hacked app, or OS X was installed under a different Apple ID.