A couple of things to clarify here.
At best, you paid no more than $1500 for that computer, monitor, keyboard, mouse and printer when you purchased it brand new 2 years ago for personal use.
When converting it to a business asset, you can not expense used equipment that was personal use prior to it's business use. You have to treat it as an asset and depreciate it over time. Computer equipment is depreciated over 5 years. It's cost basis is the "LESSER" of what you paid for it, or it's FMV (Fair Market Value) at the time you made it a business asset. Computer equipment losses value fast. SO at best, the total of your computer equipment "might" make it to $800. Over 5 years, that's $160 a year of depreciation. Any reduction in your tax liability each year for a mere $160 will be negligible, if anything at all.
Claiming the Sec179 for the computer is not permissible, as IRS Pub 946 states one of the requirements for SEC179 eligible property, is that it must be acquired for business use. Your computer was not acquired for business use at the time you purchased it. It was acquired for personal use. So it's not eligible for SEC179. See IRS pub 946 at https://www.irs.gov/publications/p946 where it reads as below:
What Property Qualifies?
To qualify for the section 179 deduction, your property must meet all the following requirements.
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It must be eligible property.
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It must be acquired for business use.
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It must have been acquired by purchase.
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It must not be property described later under What Property Does Not Qualify .
