Hi gfer19
welcome to the Apple (user-to-user) Community:
Re: "iMac blank screen"
You might want to check that you have the newest version of MacOS 13. Eg:What's new in the updates for macOS Ventura - Apple Support
says 13.3.1 is the newest (has bug fixes etc).
How to: Keep your Mac up-to-date – Apple Support
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Re: "you can tell the screen is on, just not showing anything".
Sometimes just re-starting your Mac can help restore normality.
Shut down or restart your Mac – Apple Support
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Re: "All of the other answers/possible solutions I have found are for MacBooks not an iMac".
If you haven't already tried these:
Apple Support's online (MacOS) articles may help:
Eg: You can check for faulty software or restart your iMac in Safe mode:
(Unnecessary virus checkers, third-party (non-Apple) apps,
even Ad-blockers, or VPN can cause problems)
If your Mac restarts and a message appears – Apple Support
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Re: "It will do it while I am actively using it as well as sometime during the night when I am not using it as I have to press & hold the power button to turn it back on".
What to do:
If your Mac starts up to a blank screen - Apple Support
If your Mac doesn't start up all the way – Apple Support
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Re: "Sometimes have to press and hold the power button more than once to get any sort of response".
Ways to start up your Mac – Apple Support
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Re: "It is updated to the most recent macOS ventura, and isn't even 2 years old yet so I really don't understand why it is doing this all of a sudden"
.
You might want to check with the experts if your less than 2 years old iMac is covered by Apple Care:
Eg: You can enter the serial number to check coverage:
Check Your Service and Support Coverage - Apple Support
or
One stop for technical support, Apple hardware service, and software support. Call Apple Support at 1-800-APLCARE (or use the app)
AppleCare Products - Apple
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Another avenue is to reach out to the iMac Support Team:
There is a "Get Support" link (eg: online chat, phone, eMail etc)
at the bottom of their webpage (link below):
iMac - Official Apple Support
or
Apple phone numbers around the world
Contact Apple for support and service - Apple Support
All the best :-)