"miniDVI-DVI adaptor" + "DVI to VGA cable" can't detect LCD TV

Hi,
I just bought a "miniDVI-to-DVI" adapter, and then a DVI-to-VGA male-to-male cable to connect my MacBook to Viewsonic 19" monitor but my MacBook didn't detect the 19" monitor. (This 19" monitor has only VGA but no DVI input!)I tried it on my friend's 32" LCD TV but it couldn't work too.
Then I tried to connect my MacBook by using "miniDVI-DVI" adaptor + "DVI-DVI male to male" cable to DVI socket of my frind's 32" LCD TV. It worked! So I think it's not the problem of the "miniDVI-DVI" adaptor.
I worried that it's the problem of the "DVI-to-VGA" cable so I went to the shop to exchange another new "DVI-to-VGA" cable. But my MacBook still couldn't detect all these 2 monitors via VGA socket.
Can anybody help me? Please advise! Thanks!

Hi,
Thanks for your response.
The shopman told me that "miniDVI-VGA" adaptor was out of stock, only "miniDVI-DVI" adaptor was available yesterday. At that time I thought I had to buy a connecting cable also (no matter it's VGA-VGA or DVI-VGA cable).
Since my friend has a DVI-DVI cable, if I buy this "miniDVI-to-DVI" adapter I may share my MacBook with his 32" TV too. So I bought these adaptor & cable.

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