Unfortunately, if the VC has decided to not to participate in any future financing, the failure of the company may be a best case scenario for him. Think about it from his point of view--two of the worst things you can do as a VC are:

- Throw good money after bad by pouring more money into a loser, and

- Give up on a company, only to have it succeed without you, either through a cram-down or an acquisition on unfavorable terms

So in that situation, the VC's interest is that your company either succeed without further investment or go out of business.

I wish I had good advice for you--perhaps, as some others have suggested, threats may help. My guess is that you don't have much to lose.