jb101
I just loved the way that the IT department would answer the phone and by saying "Have you tried turning it off and on again?" .

That's pretty much what I do right now! 

My favourite IT guy, Simon from The Office
 

One of my favourites in "It's Always Sunny in Philadelphia" particularly from Season 2 when Danny DeVito joined the cast.
Although a cartoon not a sitcom, give "Rik and Morty" a spin. Both are on Netflix from memory although Rik and Morty may only be available on Netflix UK

Always Loved the IT Crowd.  Anyone who has ever done support can see some real truth in this (Have you tried turning off and on again?)
 
Another of my favorites was Coupling (The British version not the terrible US remake).  The guy that played "Jeff" (Richard Coyle) was comedic gold.  Warning though:  This may seem sexually explicit to US viewers.
 

For silly comedy I always liked Night Court

BobF
For silly comedy I always liked Night Court

Dan Fielding was a role model in my childhood.

Hatstand
One of my favourites in "It's Always Sunny in Philadelphia" particularly from Season 2 when Danny DeVito joined the cast.
Although a cartoon not a sitcom, give "Rik and Morty" a spin. Both are on Netflix from memory although Rik and Morty may only be available on Netflix UK

 
It's Always Sunny is definitely in my top 10 all time favorite shows. It's hysterical. Danny DeVito must be one of the funniest people on the planet and I think that show has been the best vehicle for him, even better than Taxi. The writing is superb and all cast members are amazing. Gonna be very offensive to some people though. 

Good point James, I forgot I am not easily offended :)

The IT Crowd was great. I loved the painfully realistic depictions of the lives of IT trolls lurking in their subterranean lairs. This is a world that is immediately recognizable to me. 

sharke
 
 
I'm Alan Partridge was superb, another of my favorites. Steve Coogan at his very best. I think it helps to be British to appreciate Partridge because a lot of what makes him funny is his references to the dull, humdrum side of UK life. For instance, references to eating scotch eggs from filling stations etc. I love the shot in one episode of him walking alongside the dual carriageway to get to the filling station, it really echoed with me and all the times I've found myself in similarly dull & bleak situations. I thought the scenario of him living in the motel was great - there's a scene where he calls reception and says "Hi Susan. I was a bit bored so I dismantled my Corby Trouser Press. I can't put it back together again.Will that show up on my bill" - classic Partridge. 
 
 

 
Doesn't help me. That guy is about as funny as being repeatedly kicked in the bollocks by a man with concrete wellies IMO.
 
Give me Modern Family or Two and a half men (with Charlie in it) any time instead of that.