probable cause: there is an external device connected to your computer like printer, external hard drive or docking station. remove any if there is
could be a video card issue: try using an external monitor if you will get to see anything on it. if video card is integrated and you still have a warranty in your system have your motherboard replaced. when you use an external monitor be sure you know how to switch the screen from your lcd to the external monitor.
when you turn on the computer do you get to see anything come up on your screen before it goes blank?
try also removing the memory/ies of your system. see if you will get to see an error message on the screen and beeps from your computer without the memory. then try putting back 1 at a time and try using other memory slot to check if one of the slot is not working or just your memory
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Sounds like a motherboard or maybe a hard drive problem. It could also be a power issue. Check this first: Is the power adapter plugged into the wall? Is the computer end of the adapter putting out the correct voltage (~18v)? Try booting without the battery. Since this is a laptop, you really don't have the option of disconnecting your hardware. So I would try to boot it up and press the F2 key (or whichever key it is in an Acer) to get into setup. Next try to boot it with a system disk (CD or DVD). If all these fail, you are looking at a motherboard problem, in my opinion. You could remove the hard drive and try to start it just to be sure that the hard drive isn't causing the problem.
Just out of curiosity, you haven't got a usb device plugged in as you are booting the laptop have you? If not, try this:
Remove battery, unplug power, hold power button for 60 seconds, turn on
computer with power plug only, then shutdown, add battery and restart
If that fails to work, check that the charger indicator light is not flickering, this indicates that the power is not completing the circuit (damaged power capacitors/ fault on motherboard.
Are you using a genuine Toshiba charger, these laptops are prone to breaking down if an aftermarket one is used, a non-genuine one can damage the motherboard as well.
How many blinks does the caps lock make? Flashing caps lock is usually a sign that the Ram may be failing. You can try replacing the Ram modules to see if it boots, also, a dying hard drive will prevent booting, remove and see if that allows the laptop to power up
After that, I'd suspect the motherboard is damaged and will need replacing
Does it boots windows? If the screen gets blank after Windows booting up, you can try repairign the OS. If the whole unit doesnt boot up, then the hardware must be in problem. Check the Hard disk, the power supply and the RAM.
it is possible for a virus to infect the cmos chip, but i didn't think it was possible unless you were performing a bios flash. however, it may be possible that the virus found a new vulnerability through your tweaking program, if this brogram can change motherboard hardware settings such as front bus speeds...