I want to start by saying I only know the basics about plumbing so I may ask for clarification on some things. As the title states I have a toilet that won't flush. This toilet is in the master bathroom. This started about a week ago and since then I've tried several things to try and determine the cause and I'm running short on ideas. Nothing seems to be conclusive. Each flush attempt the water sits in the bowl and over the course of an hour goes down. You can slightly hear water draining from the toilet while it does this. I've tried some things from what I have read on other sites and Youtube. Here's what I've tried: Plunging like there's no tomorrow. Did this on several occasions over the course of the week. After enough plunging the water level goes down but it never "flushes". Pouring a bucket of water down the toilet (trying to eliminate water pressure and clogged jets as the cause). The bowl just fills up. No flush. Ran a 5ft closet auger down the toilet. No resistance going in or out, nothing pulled out on the auger. Poured hot water and dish soap down the toilet. Let sit for an hour. This had no effect. Water level continued to slowly recede like it has since this started. Replaced the toilet completely. Wife said she wanted a new toilet and I wanted to rule out the toilet as an issue. Upon installation of new toilet and wax seal no change in behavior. Flushing still just fills the bowl. Slowly recedes over an hour. Removed new toilet and poured a bucket of water down the drain pipe. The water level in the pipe does not rise no matter how much water I pour down it. Ran a 20ft drain pipe snake down the pipe with zero resistance. Pulling it back up and there's nothing snagged on it. Inspected the toilet flange and there's no crazy obstructions there. It doesn't appear to be undersized as it fits perfectly over the drain pipe and onto the toilet. Some details about what is going on around it: In the same bathroom the drain for the sink and tub are quick and are not backed up at all. No slow drain there. No other drains in the household have this problem. It's only the toilet in the master bathroom. On one occasion when the washing machine was running we noticed the toilet started gurgling. Just over a week ago this thing flushed fine. It backed up a couple times and cleared and since last Monday it won't flush at all. None of this seems to make sense to me. I can pour water down the toilet while it sits in the tub and it "flushes". I can pour water down the drain pipe and the water level doesn't rise so it doesn't appear to be backed up. But if I put the toilet on the drain pipe the system fails and doesn't flush. There doesn't seem to be an obstruction in the main pipe otherwise the sink and tub would back up. The toilet is new and we don't have kids so there's no chance something got flushed down there. This new toilet hasn't seen human waste yet. I'm out of ideas and could use any advice you guys would be willing to give. Thank you!