1994 Chevy Blazer s-10 LT 4WD problems?

I just bought a 1994 chevy blazer with the automatic transmission and 4.3 liter v6. the 4wd worked when i bought it, but i never drove it around in 4 hi to see how it ran. today i did, and it worked perfectly. then i took it out of 4 hi and into 2 hi. later on tonight i tried to get it into 4 hi again, and it wont engage. i can get it into 4 lo if i coax it a little bit, but all it does is both the 4 hi and 4 lo lights blink, and then it goes right back into 2 hi. any suggestions?
 
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