Most likely the hard drive has died or the cabling to the drive is disconnected or faulty.. If the hard drive is easily removable like most laptops, try removing it entirely from the machine, then slide it quickly back in the computer to make sure the connections are reseated. If that doesn't work and if you're unfamiliar with how to open and repair laptops, you'll want to take it to a repair shop.
Hope this helps.
I have an Acer Aspire 5520 that worked for about 13 months and now will not boot through to Windows. For a long time it would flash the green around the power, make a weird noise, and then quit. After reading some advice, though, I was finally able to get to the ACER splash screen.
Now when I turn the power on, the ACER splash screen will load and I am able to get into my BIOS settings with F2. After that, though, a black screen with a blinking cursor (underscore, not mouse pointer) in the top left hand corner.
What I have tried so far:
Pressing the Lock keys while at the black screen.
--My result: The computer acknowledges these by their corresponding lights coming on.
Popping a CD in while at the screen.
--My result: The CD drive sounds like it is reading the CD, but nothing happens on screen or audiolly. (Tried with software CD and music CD.)
Putting a cordless mouse's usb stick in the usb drive.
--My result: The mouse will light up, which tells me the usb drive is working, but nothing changes on screen.
Holding SHIFT to try to get sticky keys to come up.
--My result: Nothing happens.
Typing Windows Key+R c:\windows\explorer.exe to see if anything will happen from that screen.
--My result: after "L" everything I type beeps. (nothing appears on the screen when typing) I have tried typing miscellaneous other things as well, but after a few words, it just starts beeping with every key.
--My result: The computer shuts off as soon as this combination is hit.
Booting with just power cord, just battery, and both.
--My result: The same with any. (I have also verified the power cable works with another laptop.)
Alt+F10 to get to erecovery.
--My result: The same black screen. (verified D2D recovery enabled in BIOS)
Leaving it on the black screen for an hour.
--My result: The screen still there.
Downloading a Windows Vista repair .iso and burning to disc. Setting boot to CD from F12
--My result: Sounds like disc spins, black screen with cursor appears, and then screen goes blank and laptop turns off.
A motherboard analyzer from ebay.
--My result: Code --FF appears. (can not find the manual to figure out what that means, though! )
About 5 times, instead of the black screen with the cursor, it will say:
NVIDIA Boot Agent 249.0542
A line about NVIDIA copyright
A line about Intel copyright
and then it will shut right off.
I can not figure out when these come up what is different than before.
Once, and only once, it came up with this after the ACER splash screen:
NVIDIA Boot Agent 249.0542
Copyright (c) 2001-2005 NVIDIA Corporation
Copyright (c) 1997-2000 Intel Corporation
PXE-E61: Media test failure check cable
PXE-M0F: Exiting NVIDIA Boot Agent
It stayed on for about 25 seconds and then turned off. I copied it as closely as I could knowing it would probably turn off, but there are probably some missed punctuation, words, or mistyped numbers.
I do not really have any experience with all this behind-the-scenes/hardware stuff, but I can follow directions, so if anyone has some helpful suggestions, I would really really appreciate it.
After the above, I connected an external CD drive to the laptop, put the Windows recovery disk in it, and set it to boot from that drive. This time, it went to the black screen with the cursor in the top left but then turned all black and said toward the bottom center something like Windows is loading files. Before I got too excited, though, the laptop shut off.