Sudden black screen (not kernal panic)...

Question

Hi,
I feel like I may be posting too many issues over the past day, but this one's the most serious for me and this forum, I think, is the right one (someone steer me elsewhere if you think otherwise).
I got my computer back two days ago after sending it in for both a faulty speaker and the dreaded whine. Here;s what they replaced (btw way, both the whine and speaker were fixed):
SVC, MLB 2.0GHZ, 256VRAM(M1-CAP)MBP15"
ASSY, INVERTER, NCC, MBPRO15"
PCBA, LIO/AUDIO (M1) MBPRO15"
FLEX ASSY, LIO/AUDIO, M1
SPKR ASSY, PURCH, M1
So, earlier today I went to print something out, fine, but for some reason the CPU continued to register something still in the process of printing. I had no idea this was the case, really, except that the computer sounded like it was roaring loud and when I checked the cpu info it showed the printer still cranking the cpu (between 55 and 95%), although the printer was not attached to the computer (I'd succesfully printed what I wanted to print).
So, I went into the printer utility, noticed it seemed to be in process of printing another page; after I deleted that job the cpu slowly returned to normal, the roaring engines (fans) quieted down, etc. Then, all of a sudden, the screen went black. I cannot wake it (the sleep light is not on, btw, but I can hear some very soft noise under the lower left corner, so I know it's not completely shut off) although I'm sure I don't know all the tricks to try at this point. I should point out that this sudden blank-out has happened a time or two in the past two days, but I'd thought it was battery related. Did a calibration and the battery seems strong and fit. Anyway, the computer was plugged in to AC at the failures.
Now that Apple has this sudden popularity and has not increased their tech work force, as far as I can tell--twice in the past week my wait time has been over 30 minutes--I'm more loathe to call them. Plus, it seems that, although I'm the first to admit I know little when it comes to saavy tech info on the Macs, despite my having been a Macuser for over 20 years (I go by feel, with all its ups and downs, I guess), it seems that I know more than the tech person i get on the line. This is disconcerting to me. Example, I was dealing with a mail app issue and I asked the tech person what the Envelope Index was and was told that..."uh...I've heard of it, but I don't know what it does." I love my Mac, always have, so this tech issue (long wait time and less than informed answers) strikes me as odd at best.
Anyway, I post this here in hopes that I can get some assistance from some of you tech saavy and generous forum contributors might help. (I'm on hold now for this with Apple tech for 35+ minutes now.)
Thanks, Paul
PS I'm using another computer to post this now.

Answer 1

Well, I've been with tech support now for 40 minutes (call's been hour and twenty so far) and it seems it's a hardware issue, not battery and not software. The black screen is happening faster and faster. Have reset PMU, PRAM, etc. No luck, so I'm on hold, being bumped to a higher authority. I'll mark this as answered, simply because it appears to be on the wrong forum...probably.
PM