Docked MBP often will not wake

i've switched pc mac. got 13" mbp , 1 of henge docks. i'm not sure if problem @ point dock, or understanding of mac's sleep/wake function. after being asleep or turned off long time, won't wake. understanding when mbp closed , connected external keyboard, mouse, , monitor, should wake when monitor turned on and/or key struck on keyboard. when happens external monitor blue, tells me getting kind of signal mac, because other times monitor has floating display says 'check signal cable' or something, tells me it's not getting signal mac. in these cases, resolved when take mac out of dock , re-insert doc. don't want have time, or every day. work (meaning wake when key struck) when it's been left shorter periods. don't know if works because it's in different category of sleep mode or what.

 

i had return product similar hengedock (twelvesouth's bookarc) because macbook pro wouldn't wake reliably either. instead got griffin elevator stand , leave screen open brightness turned down. screen open, wakes when want to.

http://www.amazon.com/griffin-1093-curv2-elevator-computer-laptop/dp/b000ncy0gu

 

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