iMac 2007 computer clocxk

To be honest it is many many years past it's retirement age. When you do get yourself a new Mac your experience will still be great however substantially different. If you have a lot of third party legacy apps so you will have to leave behind as they may not have 64 bit counterparts which is required on all Macs for many years now. You can use a tool like Go64 (Google it) to see what apps are 64bit. To make your migration easier when the time comes it would be wise to go through each and every third party app you own and see if they have a 64 bit version and then upgrade your app. If they don't have a 64 bit version then you will at least know what you will need to replace.

When you are ready to migrate you can use Migration Assistant to migrate. Below are some instructions you can use when the time is right.

__________________________________________________________________

·       Always connect your old Mac's Time Machine External Hard Disk prior to startup, this will allow a migration from your TM backup and it will be dead simple! When you start the new Mac for the first time it will startup Setup Assistant (SA), SA will get to a point where it asks if you are migrating from another computer, select Yes and follow the on-screen prompts and it's done! It is that simple! This is the easiest, quickest and most reliable method to migrate from the old Mac to the new Mac is to simply connect the old Mac's Time Machine External Hard Disk to the new Mac using a USB cable before you turn on the new Mac. 

·       NOTE 1: You will likely need a USB A to USB C adapter, you can find them on Amazon for $10 or less.

·       NOTE 2: If you have already done SA on the new computer then simply connect the Time Machine External Hard Disk using a USB cable and launch Migration Assistant (MA) which is located in Applications - Utilities - MA. Then follow the on-screen prompts.

·       The ONLY difference between MA and SA is MA will create a new user account that you need to log into.

Both SA and MA migrate applications (not 32 bit apps), data files & settings. They do not migrate Mac OS itself. Some professional apps such as Adobe and Microsoft apps may require re-installing their apps as they will not allow them to be migrated. As long as you kept the security keys for installing their apps, it is not an issue. 

Finally, never EVER use Wi-Fi when doing Setup Assistant or Migration Assistant. Why, it simply fails in most cases. Please read and follow the directions in Setup Assistant and Migration Assistant. If you do not have a Time Machine backup of the older Mac then create one! If you are not aware of Time Machine, please read Back up your Mac with Time Machine and finally if you need an External Hard Disk to use as a Time Machine External Hard Disk then many experience users on these forums prefer the OWC Mercury Elite Pro due to it's reasonable price, high level of quality and ease of use. 

A web search for something like iMac 2007 battery replacement may also provide you with additional information.

https://everymac.com/systems/by_year/macs-released-in-2007.html

If the computer is that old, it may need a new clock battery.

How easy it is to get to the clock battery, I don't know offhand. The original Macintosh had a plastic battery hatch of the sort found on many consumer electronics devices, making it easy to get to the battery. On another Mac, the battery was buried inside, but it turned out you could take the top of the case off without any special tools.

It will require removing the front panel (everything does, except for RAM) but should you decide to do so, the NVRAM battery in that particular model iMac is very easily replaced.