Rod problem... One of the electrical connection posts that are on the top of the rod appears to be broken which causes the power head to work only when it makes contact. Is this repairable? If not, is it replaceable? If not, are the rods available for purchase? The vacuum cleaner itself works well,

try to dismantle the motor assembly and remove the broken plastic that connect to the belt maybe it is the one create loud noise.

The plastic clips in the handle that hold the trigger may be broken. Take the handle apart and inspect this area closely

If you take the head off, the part with the brush roller in it, off the vacuum cleaner and look to the left of the hole you will find a black sort of rectangular box with two screws on at the top and one at the bottom. This part is called the dead man switch. You will see a silver metal rod with a flat end sticking out of the top. If alligned properly, when the head is attached or the tool hose it turns on the vacuum cleaner. This may be out of allinement. To fix it remove both screws. You will see at the bottom of the another sliver rod with a circle at the end that goes back inside the machine. Take a neddle noise plyer and bend the circle part slightly. Reattach the rod and replace the screws. Depress the top flat part with a flat head screw driver and see if the machine come on. If so your done, if no follow the same steps again till the machine comes on.

You have a reversible wand on the DC07. You have to separate the wand from the hose first, then turn it around and reconnect it. Once that is done you will be able to use the attachments on the end of the wand. You can also connect your attachments to the hose.
To separate the wand:
1) Take the wand off the back of the machine
2) Place one hand on the Handle and one hand on the gray flexible hose.
3) Push the flexible hose down. You will see a long metal rod appearing. Push until the hose clicks into place at the bottom of the metal rod.
4) You'll see a half-moon shape button with a picture of a lock on the solid gray plastic part at the top of the hose - push it, this will separate the wand from the hose.
5) Turn the wand around
6) Push the purple wand cap with the holes in it back, it exposes a short dark gray pipe, about an inch in length
7) Connect the hose to the short pipe
8) Attach your tools to the top of the metal rod and have fun

USUALY REMOVING THE 3 TOP SCREWS COMPLETLY YOU CAN NORMALY LIFT OFF THE TOP WITH EASE.

IF YOU CAN DO THIS REMOVE THE ROD TRIGGER ASEMBLY FROM THE TOP AND THEN PLACE THE BARE ROD BACK INTO THE BASE WITHOUT THE TOP AND ALIGN THE ROD TO THE TRAP DOOR LATCH AND GENTLY PUSH DOWN WITH SOME PRESSURE AND WITH A BIT OF LUCK SHOULD RELEASE BOTTOM FLAP IF SUCCESFUL WASH BOTTOM LATCH ASSEMBLY WITH HOT WARE AND REMOVE DUST & DEBRIS AND REASSEMBLE,

well, i post an answer in the wrong field, and i can't find it, so i will type one more time.
slide two vinyl side pieces off, and remove top halves. remove two screws from the switch, and remove it from top halve. between switch and outside button is a plastic rocker, which is broken. you will find two broken pieces, one spring for the rocker piece, and one small plastic rod, which goes inside of the spring for support. i do not know if part is available, but you can for quick fix like me, turn the switch on by the hand, assemble unit, and plug in, and plug out from the wall. whay? i dont have electrolux store close by.
john

The catch/latch that is on the bottom of the bin button release has likely broken.  
If you take out the canister (as when you are dumping the bin), and flip it upside down and then squeeze the bin release button, you will see that it moves a rod inside the cyclone assembly.  At the end of this rod is a plastic (plastic.. redundant, as the entire Dyson is practically plastic) latch that catches onto the bin's lid and locks it in place.  A broken latch means it doesn't lock the lid in.
What you need is a replacement latch.  Note that the "Bin Release Button + Rod assembly" that are sometimes sold on ebay do *not* contain the latch at the end of the rod.  Also the bottom bin assembly does not contain the required parts.
The cyclone assembly should have the full bin release rod + latch, so if you can't find the latch, then a new cyclone assembly would work also (but will cost more, obviously).

What has worked for me on this vacuum is once the handle is off and the on-off switch is visible, work it back and forth manually.  Mine was very stiff and it did not get any better.   I went to radio shack and bought a spray can of Control/Contact Cleaner and Lubricant. It comes with a small piece of tubing.  I put the tube into the top edge of the switch and pushed the button FOR A FRACTION OF A SECOND and then did the bottom edge of the switch.   I worked the switch manually a couple of times.   I repeated the spraying one more time and the rocking.   I put it all back together and has been working fine for me.   This stuff is made for electrical contacts...  HOWEVER, use it very very sparingly!!!  ALSO, a new can has a bit of pressure so watch out that you don't blow some back at you.   JOE

The switch is very cheap. I have the same vacuum. The solution is to stick a thin peice of cardboard under the slide track for the rod in the handle assembly. You will see the rod when you disassemble the handle for the sweeper. Move the on/off switch on the handle assembly a few times and look at the bottom of the of the assembly to see a thin black rod with cut grooves. This rod activates the on/off switch.

There is a little track that this thin rod of plastic travels along. However over time the the plastic rod begins to recess further into this track. The rod still slides but is now to far away to activate the on/off switch. This isn't very technical but just slide a thin peice of hard paper or cardboard between the rod and the slide track.

Make sure the red on/off switch on the sweeper is set to off. Put the handle back with the switch in the off position. Test the sweeper using the handle a few times before reassembling the screws. This fix may not be permanent according to how you have the paper/cardboard set between the slide track and the rod but it works very nicely.

Hope this helps! : )

THESE BRUSHROLLS HAVE A RUBBER PAD WHICH IS CALLED A CLUTCH PAD. THIS MAY BE WORN, OR THE SLIDERS MAY JUST NEED A SMALL WASHER WHICH YOU CAN GET FROM YOUR LOCAL RICCAR DEALER. ALWAYS MAKE SURE YOUR LINKAGE ROD IS CONNECTED PROPERLY. ROD SHOULD BE ON THE BOTTOM PLATE SIDE, IF YOU HAVE THE MACHINE TURNED OVER WITH THE BOTTOM PLATE OFF IT SHOULD BE ON TOP OF THE BRUSHROLL.