There are days for every writer when the words won't come, when the blank page refuses to fill up with inspired prose.
For me, the blockage gets worse the longer it lasts. It swells and bloats like a living thing, moving in my guts (but not in a good way) and tells me to just give up and (on really dark days) to get a real job.
But on good days, when the words are coming faster than I can type and it's all just falling into place and every word is perfect, I remember why I love to write.
My remedies for blockage include outlining, jotting notes, and drawing pictures. Getting off the computer helps. Reading and researching (for me) are really just avoidance tactics, although occasionally they can provide inspiration.
Even when I don't feel it, I try to write something. Sometimes "something" turns into something wonderful: yesterday, for example, I had an epiphany. I needed a political scandal and was stumped--until I realized that it was the opponent who got caught with his hand in the cookie jar, not my candidate. And then I wrote 17 pages.
Today my characters are on a collision course--but only the villain knows it. Happy times!