Reddit reviews TOGGLER SNAPTOGGLE BB Toggle Anchor with Bolts, Zinc-Plated Steel Channel, Made in US, 3/8" to 3-5/8" Grip Range, For 1/4"-20 UNC Fastener Size

http://www.amazon.com/TOGGLER-SNAPTOGGLE-Zinc-Plated-Channel-Fastener/dp/B00GVK904A

Use these to mount L brackets off the wall, then put screws with the head chopped off into the bottom of your "feet" (the blue things in the 4 corners) and those will fit (hang) into the hole of the L bracket. I'll draw a picture... http://imgur.com/qtSSMo8

Can we see the front of that? I like lights :-)

the drywall is either hung on 2x4 studs which is mounted to the cinder block wall, or for space and cost they could have mounted furring strips to the block wall, then attached the drywall. that outlet cover that you removed, how much space is in that cavity before block? is it a regular depth box?

What size TV are you going to hang? static mount our swing arm? whatever you do, after mounting the bracket hang from it. if it's holding your ass up there, it will hold a tv just fine.

if there is a cavity of space in there, there is probably solid wood holding up the drywall. lag bolts will be fine in the studs. if the block is real close, well then things get tricky. i'd probably suggest trying to butterfly anchor into the block.

http://www.amazon.com/TOGGLER-SNAPTOGGLE-Zinc-Plated-Channel-Fastener/dp/B00GVK904A

i would also make sure your holes are still over the stud area, you will need that as a backing and support to any bolt/anchor you press against the drywall.

Use snap toggle bolts.

http://www.amazon.com/Mechanical-Plastics-Toggler-Snaptoggle-10-Pack/dp/B00GVK904A

Please remember that the bolt is only going to be as strong as the wall. As always, if you want real strength, like putting heavy books on a shelf or mounting a tv or something, you're gonna have to find some studs.