98 Blazer 4x4

I have a 98 Blazer with 54K miles. A month ago I could not get the electronics to shift out of 4H. I found a fuse had blown and it defaulted into 4H. Last week I was driving about 50 and noticed that I had left the trans in 4H. I took my foot off the gas and let the RMPs die down then pushed the 2H button. All buttons started to flash for the trans and it feels like I am stuck in 4L. I checked the fuse again, hoping, and that had not blown.

Any ideas?