System wouldn't power up and when i replaced the power supply it now powers up without pushing the power button but does not even enter bios (screen is blank as if no output). Won't spin up or read Windows install disk. System is a gigabyte GA-8Ipe1000 motherboard- have tested cpu, dvd drive, and video card in similar sister pc system. Have not swapped out case or motherboard. Can this be a corrupt bios and can I reload without at least loading bios. thanks David A.

This is a fix that worked for me, however I cannot tell you why or even feel that I had done anything which would constitue this as a fix. I leave my PC on 24-7 and came in one morning and it was locked up. Couldn't get a video screen, not even reset worked so I threw the power switch on the back of the power supply. Turned the switch back on and pushed the power up button. The MoBo started 1 long and 2 short beeps, repeating. I pushed the reset button and same thing. I again turned the power supply off, then on again and same thing with the beeps. So this time I turned the power supply off then also un-plugged the power cord to the power supply. I left it that way for maybe 10 minutes, while I did a few other things. I plugged the power cord back in, turned the power supply back on and hit the power up button. My PC booted up...no problem. ???

Point is - this issue as reported by others may just be a hardware or bios fluke and needs a power reset or maybe even clearing the bios and restarting. Reseating the memory sticks, use just one memory stick and rotate the memory sticks to sort out the possible bad one and reseating the processor may also help.

Hi,

Did you try taking out and then putting back in the RAM?

Power supply board have problems.Tries Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

When the power supply failed, it took the motherboard out at the same time. Time to replace it.

Check the battery voltage. The battery may have failed and is overloading the AC pwer supply.

Try going to the horses mouth (Acer) next time. From their on-line support:
Product
Veriton M420
Issue
Chassis Opened Warning Error
Solution
To disable the Chassis Intrusion Alert, please follow the steps below.

1. With the system powered off; press and release the power button.
   Immediately afer releasing the power button, begin tapping on the Delete key.
   This will enter the system BIOS.
   In the BIOS, use the arrow keys to navigate the menus.
2. Navigate to Integrated Peripherals and press Enter.
3. On the Integrated Peripherals screen, there is an option labeled OnBoard IO Setup. Select OnBoard IO Setup and press Enter.
4. Look for the option, Chassis Opened Warning.
   Select Chassis Opened Warning and press Enter.
5. Change the currect selection from Enabled to Disabled and press Enter.
6. Press F10 and then press Enter to Save the Settings and reboot.

The computer should boot without the intrusion alert message.

Yes it is motherboard issue

use my acer aspire daily, went to put a memory stick in and it just died, no power at all but power light on charger still showing green

Try pressing the power button and press [del] button. See if it goes to the bios setup page. If it does, have your harddisk checked. It could be corrupt OS or problem with your harddisk.

If you have had this problem sence the system was built and your power supply is less then 400 Watts. You will need a 400 Watt power supply or higher. Check the specs for our motherboard.