Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: I bought this a few days ago, and tested it twice. But when I got home to use it for real, it doesn't work! I used different cables and everything. Could it be defective?
Document: I'm not too technical about the DVI and I haven't used other converters to compare,but all I can say that it simply works and works great! Everything holds tight and well constructed. Though what I got was bit different from what you see in the picture. No Startech label and number of pins are less than what you see.
Tested extensively on 2 monitors with 2 VGA cables (both monitors and computer graphics cards are compatible with this plug-in) and it did not work on either. The shipping address was messed up, so I actually got 2 and was able to test both and neither worked. I did get a refund though so that's why I give 2 stars.
I must have gotten a faulty one because it doesn't work. I've tested my cables and they work fine so something is up with the adapter. At least it was only $7 that I wasted.
Either way, it was still only $2 and it was worth it because it meant that I got a better deal on the cables than if I had bought them in the first place. (Two sturdy and long DVI to DVI cables for under $10 shipped; they weren't available for that price when I bought the adapter and I just checked, they're not available at that price now.)
Old monitor - new computer. The new PC's only accept digital cables (the white end cables), old monitors typically have only analog cable (the blue end cables)  this makes them work together, so you don't have to buy a new monitor just yet.Besides I think LCD monitors are just a fad, my giant CRT is going to be back in style real soon!
I use this adapter to connect my Mac Mini to an older monitor. It works great. I haven't even had to think about it since I purchased it 6 months ago. I got it, plugged it in, and it worked. Be sure that this is the product you need before you buy it, but if it is what you need it works great and is a good price.
I bought this converter to use it on my xbox and lcd tv/monitor (tv does not have a vga input) It works as intended, I'm able to play xbox. Reason why I'm not using component cables is that I want to up convert dvds on the HD DVD xbox player. Gotta say dvds look pretty close to HD however (downside) some how I may be loosing HD quality when playing HD games.. Maybe is due to the convertion from vga to dvi..
I purchased this adapter because I work on lots of computers. My monitor is VGA, but not all customer computers have VGA ports. By using this adapter I can work on computers that just have a DVI video port. It's easier to use the adapter than it is to have to switch cables for my monitor.
I have not used it yet, I bought it to  have it as a spare part or so. I might use it soon
I'm using this to convert my dvi connection on my new graphics card to vga (I know, it sounds stupid, I' doing it until I get an hdmi monitor). Works quite nice no problems at all with quality. Bought for around $1 so it is not a huge loss if it doesn't work out (as noted in the other reviews, but under different circumstances). If you are using this adapter in a similar manner to the way I am using it, then don't hesitate to get it.
Answer: I assume it worked at some point (adapter) as you said: tested it twice.  Mine worked fine when I made the adaptation.  There is a lot of connection pens to mate up.  Make sure one of them did not get bent and all connections are tight. Sounds as though it could be your home computer as well.  Change out different connecting cables again, if it does not work then I am betting it is your computer.