After sitting for a week first layer won't adhere Last week I set up my Ender 3 V2 and it seemed to work perfectly out of the box. I leveled the bed, did a test print, and discovered that the nozzle was too low (successful print but elephant foot). Re-leveled at a slightly higher height (lower bed level) and was able to produce a very lovely benchy and dog.
Then I turned it off and let it sit a week until I had something to actually print. Now the first layer fails almost immediately. It will put down a line and when the nozzle comes back around it will knock it around producing a spaghetti monster. I've tried re-leveling, cleaning the bed with rubbing alcohol, using previous G-code that worked fine last week, positioning models in different spots on the bed when slicing, but no matter what I do, nothing seems to stick.
I've cleaned the bed as well. It is quite dusty here so it definitely needed that, but it doesn't seem to have fixed the issue.
If your having first layer adhesion issues:
Please try one (or more) of the following (Start with #1), and remember that all of them are equally important!

Make sure your bed is level (Maybe use a leaving stick (or whatever those bubble things are called))

Be sure the bed is clean (I recommend glass cleaner 1-3 squirts and then a light scrub of a paper towel)

Change the temperature of your heated bed (50 - 60 °C)

Check your nozzle height (.15 - .25 mm is what I use)

Lastly, use bed adhesion. Start with painter's tape (least damaging, easy to remove), then use a glue stick or even hair spray if necessary.