Blank screen after hibernate, no post

Question

Toshiba satellite l505d-s5983
I have had this laptop for 4 years, and recently i was running into an issue where my laptop may die in hibernation during my commute.
Usually, I could pop the battery out, use wall power, and windows would resume...
However, one day it just wouldnt come back.
I have tried draining the battery, taking it out, draining the laptop and plugging it back into the wall with no progress.
On boot, LED, USB, DVD, Fans, all work...  caps lock and numberlock flash, and go out....
Screen remains black, no post. I have a toshiba windows 7 disc, but it does no good.
I bought a usb/sata cable and I can access my HD and save my data, so the HD is good
I swapped ram chips one at a time in alternating slots and received nothing.
I plugged the ram into my girl friend's toshiba and it boots fine. So the ram is good.
I attempted using her powercord,  and got nothing.
I plugged up my desktop monitor and got nothing.
I have tried fn/f5 as well and got nothing.
I took apart the laptop, cleaned it up... stripped it down to the basics, plugged in the power and still nothing on the screen.
Having given up,  I bought the exact same laptop on ebay, thinking I could swap the HD's and be good to go...
When I received the laptop, exact same situation... alternated hd, ram, nothing. 
It appears to be stuck in hibernation, but I would assume that some combination of wall power, or draining/chargining would fix it on at least one of the two laptops.
Thoughts?

Answer 1

Thanks for the quick response...
Hi You said you have the Windows 7 disc, but it does no good. Are trying to boot from the disc. What actually happens. Do you have the boot order set to boot from CD/DVD first and HD second. Are you powering off your PC with Bothdisc in CD Rom and then powering on your PC? 
I get a blank screen and I do not even make it to post (toshiba screen) to change boot order. When I power on the laptop, and put the disc in you can hear it spin as if it is attempting to load, but nothing ever comes on the screen. I have also tried leaving the disc in, and powering on the laptop.  - With both, my laptop, and the ebay laptop.
 If you can't boot with the disc and the disc is good, you could be looking at a power supply problem, could have a bad power jack or the worst, a bad mother board. You said you tried her power cord. Not wise unless they are the same model.
I have 2 off brand power cords, specifically for my laptop. Both cords receive power at the box, and seem to do fine charging the batteries  for both as well. As a side note, booting with AC unplugged doesn't result in any changes. Her laptop (the 3rd toshiba) is an A205, and seems to have no problem using one of my cords.
Can you borrow a external monitor??
I have a monitor for my HP desktop, which is functioning. When I plug it into the wall, and into either laptop (and attempting fn+f5) I get nothing. No signal from the monitor.
PS Did you get a power adapter with your ebay PC?
It was suppose to be missing a power adapter and an OS. The seller is a computer repair place. There were pics of the laptop at post, and it is the same laptop because it shares a scratch with what was received. The guy is willing to refund me, but it just seems odd that I would come across 2 laptops of the same model with the same problem. 
I spoke to another repair person on FB that suggested taking out the cmos to drain the board, but it is soldered in. I have also left the battery and plug out for 24 hrs, thinking it may help drain some juice, to no avail.
I have been googling for almost 2 days, between msg boards/youtube etc... and i'm pretty stumped. I am not taking apart the ebay model, but i have tried practically everything i can think of, as far as disconnecting components on mine, and hoping for a post.
ultimately, I want to be able to use my hard drive as is, in a laptop, primarily because of the programs that are installed, with the least expense attached as my job will not replace the laptop.