and The answer is:
iMac (by Apple)
section 1:
Though I am not always bright
You use me day and night
means:
The iMac was a great success in relation to the lack of popularity the Macintosh had until that time among the general public and until then Apple was not bright at all but today people use their iMac day and night.
section 2:
Once I was black and blue
But I'm not silver and grey
means:
This computer broke two conventions in the world of personal computing When it was launched: it included a combination of colors of blue and white and its envelope was transparent. The iMac was a breakthrough in design and a change in the usual beige and gray colors on personal computers.
section 3:
One of me gives you more than this
But not all who know me, know me
means:
One of me gives you more than this-Today the computer gives many options of colors and models in colors such as snow, Dalmatian stains, chrysanthemum, graphite, and other marketers for all.But not all who know me, know me-People today don't know what its benefits were because of them was the big breakthrough of iMac.
section 4:
I don't discriminate
Old and young, rich and poor
means:
Old and young-The iOS operating system installed on iMac is by far the best because it is simple and easy to operate and so people of all ages and ages can use it, rich and poor -For the Macintosh market, which has always been beyond the reach of most consumers, the iMac has innovated at a cheap price (less than $ 1,300 - a breakthrough in terms of prices for Macintosh models), pointing out that Apple intends to turn to the consumer market first and thus give everyone the opportunity to experience its devices.
section 5:
I am selfish yet not
I won't die if I'm selfish
means:
iMac= i mac=very selfish,But the truth is that his name implies that it connects to the internet in a fast way, which was new at the time of its first release and a great advantage without which this computer "died" .
Hint #1:
means:
On April 1, 1976, Apple was founded by Steve Jobs and Steve Wozniak