I was having limited Wifi range, so I took out the Wifi module and changed the thermal paste. Since re-installing it, the drone won't power up. Just makes a chirping sound and then shuts off. I bought a replacement Wifi module but no change. The bottom LED's blink green very briefly, and a red light coming from the receiver board lights up. After the red light blinks the unit powers off. I know a lot of times this is traced back to ESC boards, but my understanding is if the underside LED from the ESC board blinks green at start up, then the board is OK. All four of mine blink green, very briefly. A also bought a replacement receiver board. I didn't fully install, but disconnected the leads from the old one and plugged into the new with the same result. Any ideas? I have a trip planned to the Sierras in a couple of weeks and was hoping to get some shots of Sierra canyons before the drought takes effect this summer. I really really appreciate any and all help getting this drone working again.