greyed out vs grayed out

Some examples from the web:

• Jukebox: The tracks in the imported playlists are greyed out.
• It won't let me do anything. Everything is greyed out.
• Buttons whose functions are unavailable for the current selection are greyed out.
• The option is greyed out on the Main Menu.
• If the button is greyed out, the time required to configure the probe might have elapsed.
• If the button is inactive (greyed out) then some entries in Window's registry are messed up.
• You look weird when your beard disabled and greyed out. I need to re-style you.
• So, if this option is not available (greyed out), you will have to ask the administrator to log in and change the setting.
• Note that you have to be viewing a web page for the Settings menu not to be greyed out.
• Note: the paste operations that change the audio track duration are greyed out.
• Personal Wi-Fi hotspot: Network search is not possible (greyed out).
• If you don't select the search engine, the Set as default button will be greyed out.
• Once a vote is cast, the voting buttons become greyed out for the day (from midnight until 11.59pm).
• The Edit menu has three greyed out functions which may be crucial for you:
• Because we don't want players to miss any of the great side conversations with their crew, dialogue options will no longer appear "greyed out" if a character has more to say.
• FIXED: "Adjust resolution for portrait" was greyed out in some cases
• fix to Mail Folder Location option greyed out in WebAdmin (it is now able to be edited by Global Admins)
• The text entered in one tab can simultaneously be sent to other tabs. This dialog allows you to select which tabs will get that input. The current tab will be greyed out.
• If your preferred date is greyed out and no price is stated for it, unfortunately this date is no longer bookable.
• Sections that are greyed out represent seats that are sold out, while colored sections still have spots for sale.

Some examples from the web:

• You can use the filter only with RGB images. If your image is grayscale, it will be grayed out in the menu.
• This command is usually grayed out. It becomes active if you use the Fill function or the Blend tool, or if you apply some filters.
• So in case of DVD, this option will be grayed out.
• Later, I noticed that one of the old partitions was grayed out and was inaccessible.
• Move is listed as an option, but it is grayed out for all system apps.
• Drop down box with the three types discussed previously; files, text, template. This box will be grayed out if you have the Inherit parent attribute box checked.
• You cannot add a layer mask to a layer group (the corresponding option is grayed out). But, as with normal layers, you can add a layer mask to a layer in the group to mask a part of the layer.
• The script only works on RGB and grayscale images that contain one layer. Otherwise the menu entry is insensitive and grayed out.
• The screen sharing options are grayed out.
• The option to register is disabled (grayed out).
• If the recorder can only burn CDs, the drop-down menu is grayed out.
• When an input tool is off, the button is grayed out.
• Media types not supported by the chosen optical drive are grayed out.
• HUD When interacting with a player in the world, the "Invite to Party" option now always displays, though it is grayed out if invalid.
• The screenshot at the left is from iBooks Author, and shows two grayed out arrows that are for navigating the pictures.
• This software has powerful scanning techniques that will completely inspect the drive to regain partitions that are deleted, missing or grayed out.
• NOTE: The "Order Now" button on your event listing will be grayed out for attendees until they select a date and time to attend.
• A breakpoint is normally shown as a red bar, but when you start the ICD, some breakpoints may get grayed out.
• If set to say 11, this will mean a range of 22 pips will be grayed out.
• You can use it only with RGB images. If your image is grayscale, it will be grayed out in the menu.