There should be an option for an "other" asset category, then "other" again. That will let you enter things, including selecting Straight-Line (which is still part of MACRS).
However, the number of years ("Recovery Period") concerns me. If you selected the correct category in TurboTax, in most cases it should be correct number of years. So your previous tax return MIGHT be using the incorrect Recovery Period. Assuming you are using the General Depreciation System, computers are 5 years and in most cases furniture is 7 years. If you previous tax returns are showing something different, they MIGHT be wrong. Please post back with details if that is the case.
