Dell inspiron m5010 15r 7 beeps and the black screen

Hello, my dell inspiron m5010 has gotten the dreaded 7 beeps and the black screen not even a back light. through my searching i have completed the re-flow of the GPU and the south bridge by use of a heat gun and a infrared thermometer and used antec formula 7 nano diamond thermal compound, re-seated the CPU (no damage on the chip sets that i can see). The first start up after the re-flow and i got 2 beeps.... forgot the ram cards lol. After installing the ram, power on w/o battery no beeps hdd starts its cycle cooling fan starts to run but nothing on the screen still not even a back light, also laptop does not recognize the battery so i get the blinking battery light when its plugged in but with out the battery only the far left power light and the light under the power button stay on. Now i bought this computer off ebay as a project to fix and use as a personal computer. I havent found much info for this particular case so the next thing im going to try is to take the screen apart and look for a bad cable or a connector.
I have found extremely useful information on this thread and many others for many different projects so i am grateful for any and all info anyone has.
thank you.