Attach strap to canon BG-E6 and 5D

Canon Support Drivers EOS 5D Mark II You can download any camera manual directly from Canon's website.

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Most definitely battery grip. Prone to a phenomenon know as 'flexing'. The contacts on the grip fail to connect to camera's contacts. Can cause other problems such as switching on and off when you least expect it. I got sick of going thru about two grips for every camera so went with 1D/1Ds series. You'll hear people say 'stick with Canon grips' blahhh(!) too ****** expensive and are prone to the same problem. Can't be helped when you hand hold a camera+grip for long periods - the warmth of your hands can heat up (warp) the plastics and it's all held 'together' by one little screw in a tripod mount (!)
You could 'try' removing the grip, leave it off for say a week. I don't know why it's how, but if always works like new when you put it on again. Until....it starts playing up again. :)
OEM, 3RD party... OTY. For the price of one Canon I could get two cheapies. Always had the 1D (classic) and ahem...still have it! So I stuck with the series (1D IV, 1Ds2) Still holding onto my 7D w/grip (3rd party) though.

I understand there isn't a manual, just a quick how-to guide. Here's some basic use info from a review
http://www.the-digital-picture.com/reviews/canon-bg-e6-battery-grip-review.aspx

The Canon BG-E6 Battery Grip is designed specifically for the Canon EOS 5D Mark II as shown above with a Canon EF 16-35mm f/2.8 L II USM Lens mounted. To get the Canon BG-E6 Battery Grip into the position shown, the LP-E6 Battery is removed from the 5D II and the battery door detaches. The BG-E6 slides up into the battery compartment and locks into place via the tripod socket screw seen on the BG-E6 just below the lens in the above image. The BG-E6 provides its own tripod adapter threads - this functionality is not lost.

The Canon BG-E6 Battery Grip holds two Canon LP-E6 Batteries that deliver double the number of shots or video time from the 5D II. Alternatively, use 6 AA batteries in the included Canon BGM-E6 Battery Magazine shown below.

Is this battery grip a Canon or aftermarket accessory? Have you mounted the camera to a tripod if so what lens do you have on the camera? Are you using the adapter for the use of AA's or are you using the LP-E8 battery pack? Are you using the camera in portrait position or landscape?

Here is why Canon has had in the past some problems with battery grips but I thought it was a solved issue maybe not on the entry level DSLR's. What happens is there is enough flex between the body and the grip to break connection and yes it seizes up. Most Rebels will have a plastic lens mounting flange which will also flex with the weight of a lens (longer focal lengths). Also with the longer focal length lens it has more a tendency to flex the battery grip if mounted on a tripod. Holding in the portrait position the weight of the camera is actually pulling away from the contacts so there is a whole series of little possibilities. If it's a Canon accessory then it's a warranty thing if it's aftermarket Humm not sure should have something on it but, the quick fix is to keep tightening the mounting screw/wheel. I know that wasn't the fix you wanted but hey just telling the way it is.

Well you can get the Canon Battery Grip For EOS-40D/30D/20D Model# BG-E2N, which has a separate set of controls including the wheel. OEM is about $170 Chinese clones $80. The camera body will probably sell for about $200 as is on eBay.

Please see this page, on Safari Books Online - an excerpt from Canon® EOS Digital Rebel XTi/400D Guide to Digital SLR Photography which describes the steps in detail.

hi
a number of new generation devices suffer from DOA (or early death)
often stuff happens on the first day or shortly after
thats where warranty comes in handy

return to vendor and replacement usually is offered without question

otherwise run a multimeter over the batteries and see if they have discharged themselves or failed

D