Sounds like a conflict between that specific card manufacturer/model number and the XPS 8300 since the GTX 16xx series has been shown to work in the Dell XPS 8300.  What specific Zotac GTX 1650 model number do you have (they have several)? Manufacturers that have been shown to have GeForce GTX 16xx cards working with the Dell XPS 8300 are PNY, MSI and Gigabyte, at least on userbenchmark.com.  (EVGA might be worth a try as well.)  Here's someone on userbenchmark.com running a PNY GTX 1650 in a Dell XPS 8300. I'd try a different manufacturer.  If you find a model that works for you would be good to know.
Hi, I recently purchased a gtx 1650 by Zotac Gaming to put in my dell xps 8300. I put the card in and, but when I turned the system on it would just stay in the dell boot screen. The motherboard would beep once, wait a little, while then beep again, until I manually turned the system off. I originally had a gtx 530 in the system so I decided to reinstall the original card, and Windows booted. The Bios is up to date and I can't seem to locate the problem Here are the rest of the specs as far as I know: Intel core I-7 2600 8 gb ram Geforce gtx 530  460 watt psu 1 tb hard drive 256 gb ssd Windows 10   The unit might be faulty, be I can't be certain. Any solution(s) would be greatly appreciated.
XPS 8300, GTX 1650 not working