Laptop turns on and Im getting Blank screen

Question

I have a CQ61-41QUS here that was working fine one day, next day turned it on and I am welcomed by Power light on, Wireless light on (orange) caps lock and numbers lock lights flashing twice - pause - repeat.  The charge light is on (plugged into A/C) and the power light is on, drive activity light never even flickers.  Screen is black, never posts, nothing ever comes on the screen (hence can't enter BIOS).  The Fan is running, the DVD drive makes a few clicks, but never boots even with a bootable disk in the DVD drive.  This is what I have done so far:
Connected external monitor, tried booting while using fn/F4 keys to activate the external monitor display - no change, nothing on the laptop display or the monitor display.  Have held the fn key and pressed F4 numerous times waiting 3-5 seconds in between presses to see if anything ever display - never get anything, just the same num/caps lights blinking.
- no change
Pulled hard drive, put in an external USB case, drive can be read on other computers, no errors found when scanned.
Cleaned fan/vents with compressed air
- No change
Pulled laptop battery, removed CMOS/BIOS battery, unplugged A/C adapter.  Held power button in for 1 minute
- no change
Pulled laptop battery, CMOS/BIOS battery in place, unplugged A/C adapter, Held power button for 1 minute
-no change
removed both pieces of RAM, blew out sockets with compressed air, wiped RAM module connections with soft cotton cloth, replaced one piece of RAM in first socket, second socket empty tried booting
-no change
     tried same piece of RAM in second socket, first socket empty
-no change
     tried second piece of RAM in first socket, second socket empty
-no change
     tried second piece of RAM in second socket, first socket empty
-no change
     tried both pieces in, first in first socket, second in second socket
-no change
     tried both pieces in, first in second socket, second in first socket
-no change
     tried the same thing with two known working pieces of memory in all the above combinations
-no change
     tried no memory
- no change
Tried booting with hard drive connected, with hard drive not connected
-no change
tried with a different known working hard drive installed
-no change
Tried booting with DVD drive installed, without DVD drive installed
-no change
tried with a different known working DVD drive installed
-no change
tried booting with both DVD and Hard Drive removed
- no change
removed wireless mini card and tried to boot
-no change
removed modem mini card and tried to boot
-no change
tried a completely new A/C adapter
-no change
Never any display at all, never a beep, just those two blinking caps/number lock  2 blinks / pause/ 2 blinks / pause forever.

Answer 1

The specs say it's an Ati mobility radion HD 4200. Is there a way to test it? With multi meter. I'm wondering why would I be in luck if it were intel? I'm more mechanical/electronic savy then operating system savy. Can fix most electronics. But I'm stumped on this. And am I correct in thinking the GPU Wich is the video card can't be replaced easley because it's soldered to the main boards? Or can I replace it ? Thank you for any assistance, I'm very great full.