There was a thread about this already.
But, I'll repost links.
Center for Disease Control (CDC):
http://www.cdc.gov/hiv/topics/basic/#origin
http://www.cdc.gov/hiv/resources/qa/qa3.htm
 Originally Posted by CDC
Scientists identified a type of chimpanzee in West Africa as the source of HIV infection in humans. The virus most likely jumped to humans when humans hunted these chimpanzees for meat and came into contact with their infected blood. Over several years, the virus slowly spread across Africa and later into other parts of the world.
Cure HIV:
http://www.curehiv.us/HIV-origin.htm
 Originally Posted by Cure HIV
For many years scientists theorized as to the origins of HIV and how it appeared in the human population, most believing that HIV originated in other primates. Then in 1999, an international team of researchers reported that they had discovered the origins of HIV-1, the predominant strain of HIV in the developed world. A subspecies of chimpanzees native to west equatorial Africa had been identified as the original source of the virus. The researchers believe that HIV-1 was introduced into the human population when hunters became exposed to infected blood.
Avert:
http://www.avert.org/origins.htm
 Originally Posted by Avert
In February 1999 a group of researchers from the University of Alabama1 announced that they had found a type of SIVcpz that was almost identical to HIV-1. This particular strain was identified in a frozen sample taken from a captive member of the sub-group of chimpanzees known as Pan troglodytes troglodytes (P. t. troglodytes), which were once common in west-central Africa.
The researchers (led by Paul Sharp of Nottingham University and Beatrice Hahn of the University of Alabama) made the discovery during the course of a 10-year long study into the origins of the virus. They claimed that this sample proved that chimpanzees were the source of HIV-1, and that the virus had at some point crossed species from chimps to humans.
Their final findings were published two years later in Nature magazine2. In this article, they concluded that wild chimps had been infected simultaneously with two different simian immunodeficiency viruses which had "viral sex" to form a third virus that could be passed on to other chimps and, more significantly, was capable of infecting humans and causing AIDS.
These two different viruses were traced back to a SIV that infected red-capped mangabeys and one found in greater spot-nosed monkeys. They believe that the hybridisation took place inside chimps that had become infected with both strains of SIV after they hunted and killed the two smaller species of monkey.
They also concluded that all three 'groups' of HIV-1 - namely Group M, N and O (see our strains and subtypes page for more information on these) - came from the SIV found in P. t. troglodytes, and that each group represented a separate crossover 'event' from chimps to humans.
National Institute of Allergy and Infectious Diseases (NIAID):
http://www3.niaid.nih.gov/news/newsr.../hivorigin.htm
 Originally Posted by NIAID
Until now, HIV-1’s origin had been unclear. Although most scientists suspected that the virus descended from a primate species, only three chimpanzees infected with viruses related to HIV-1 had been documented, and one of these viruses correlated only weakly with HIV-1.
When Dr. Hahn and her collaborators recently identified a fourth chimpanzee infected with SIVcpz, they decided to use this opportunity to carefully examine all four viruses and the animals from which they were derived. With sophisticated genetic techniques, they analyzed the four SIVcpz isolates and compared them with various HIV-1 viruses taken from humans. They also determined the subspecies identity of the chimpanzees: three belonged to a subspecies native to west equatorial Africa, Pan troglodytes troglodytes. The fourth, the chimpanzee infected with a virus most unlike HIV-1, belonged to an east African subspecies known as Pan troglodytes schweinfurthii.
As it turns out, the three isolates from the Pan troglodytes troglodytes chimpanzees strongly resemble the different subgroups of HIV-1, namely groups M (responsible for the pandemic), N and O (both found only in west equatorial Africa). Their investigation also revealed that some of the viruses resulted from genetic recombination in the chimpanzees before they infected humans.
Their other significant find, Dr. Fauci notes, is that the natural habitat of these chimpanzees directly coincides with the pattern of the HIV-1 epidemic in this area of Africa. Putting all these pieces of the puzzle together, Dr. Hahn and her colleagues conclude that Pan troglodytes troglodytes is the natural reservoir of HIV-1 and has been the source of at least three independent occurrences of cross-species virus transmission events from chimpanzees to humans.
The authors believe that HIV-1 was introduced into the human population when hunters became exposed to infected blood. Furthermore, they speculate that humans might still be at risk for cross-species transmission because the bushmeat trade – the hunting and killing of chimpanzees and other endangered animals for human consumption – is still common practice in west equatorial Africa.
This new report suggests that preserving the wild chimpanzee populations will be crucial for further carefully designed studies to better understand how cross-species virus transmission occurs and how infected chimpanzees resist disease, studies that in turn may lead to new strategies for designing HIV drugs and vaccines.
I know how people also like to say it was made and given to people by the Oral Polio Vaccine, well here you go:
 Originally Posted by Avert
Many people have contested Hooper's theories and insist that local chimps were not infected with a strain of SIVcmz that is closely linked to HIV. Furthermore, the oral administration of the vaccine would seem insufficient to cause infection in most people (SIV/HIV needs to get directly into the bloodstream to cause infection - the lining of the mouth and throat generally act as good barriers to the virus).4
In February 2000 the Wistar Institute in Philadelphia (one of the original manufacturers of the Chat vaccine) announced that it had discovered in its stores a phial of polio vaccine that had been used as part of the program. The vaccine was subsequently analysed and in April 2001 it was announced that no trace had been found of either HIV or chimpanzee SIV.5 A second analysis confirmed that only macaque monkey kidney cells, which cannot be infected with SIV or HIV, were used to make Chat.6 While this is just one phial of many, it means that the OPV theory remains unproven.
The fact that the OPV theory accounts for just one (group M) of several different groups of HIV also suggests that transferral must have happened in other ways too, as does the fact that HIV seems to have existed in humans before the vaccine trials were ever carried out. More about when HIV came into being can be found below.
Now, ask yourself, since most conspiracy theorists believe the U.S.A. made the HIV virus to kill off Africans and Homosexuals, why would they travel to Africa with it to inject someone there? Why not inject an African or Homosexual here in America? Also, since the first case was not only found in Africa, but as far back as 1959, do you really feel they had what it took to make HIV back then?
EDIT: Also, for your statement:
I for example, don't believe that a monkey bit a human in the ass in Africa, as the beginning of aids.
The monkey didn't bite the person, they slaughter monkeys and eat them. You know, like how we slaughter cows and eat them?
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