Computer Hope
Hardware => Hardware => Topic started by: SlawekPL on September 24, 2014, 10:54:15 AM
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Greetings!
My computer doesn't work:
-There is no BIOS beep, no post, and no video on screen
-Power supply runs, so does HDD and CPU fan.
-No visible signs of fried elements on motherboard.
I've already tried:
-Clearing CMOS via switching position of CMOS jumper and via removing the battery. I've also waited for an extended period of time before placing the battery back and before placing jumper on normal pins.
-Removing video card
-Removing the RAMs (just the first piece, then just the other, then both - triggering the long BIOS beep)
Specs:
Acer Aspire M1920
CPU: Intel Pentium E6700
Video: GeForce 405
RAM: 2GB Hynix 1333mHz + 2GB Kingston 1333mHz
HDD: Seagate 7200.12 500GB
Power: FSP Group ATX-250PA 1PF 250Watt
DVD: HL-DT GH70N
Motherboard: G41T-AM
OS:Win7 64bit
The problem appeared after force shutdown of computer via pressing power switch for 5 seconds.
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-Removing the RAMs (just the first piece, then just the other, then both - triggering the long BIOS beep)
I think the beep has to be initiated by the CPU. So the CPU is alive.
Go get some RAM. Maybe both are dead.
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Try disconnecting hard drive & see if it will POST.
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No difference after disconnecting HDD.
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What has changed since it worked > >
You may wanna borrow and swap in a known good PSU of the same or greater wattage...you;ll know overnite.
Also with all power removed remove and re-seat the vid card...and RAM stiks...
PS i know you tried a few of the steps above...but do it with another PSU...
It may be the power switch as well...
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This can also be caused by a faulty USB device. Unplug all USB devices including any hubs and reboot. If the computer boots, plug each item back in the same places one at a time, starting with hubs, and reboot after you plug in each one. If one of the reboots fails, then the last device you plugged in will be the culprit. This is a common symptom when the receivers for wireless mice/keyboards fail.
Also, what brought about the forced shutdown in the first place? Was this due to a lockup or other problem, or were you running late for a party? ;)
In regard to the BIOS beep, you probably know that the single short beep is the OK code from the POST test. The fact that you weren't getting this, means that the POST either didn't start, or didn't complete. When you removed the memory and triggered the memory error code, this indicates that the POST is in fact starting. You therefore know that there is a hardware issue that is preventing the POST from completing. You'll have to use a process of elimination to find it, or a good POST analyser that plugs into the board may help.
Another common cause for non-booting / non-POST is a faulty network card. The real problem here is when you have an onboard LAN which fails and you can't get into the BIOS to disable it. Personally, I never use onboard LAN ports for this very reason, and disable them as soon as the board is installed. The mains power around here is woeful, thus power supplies and NIC cards are common failures. The price you pay for putting power cables undergound I guess - no maintainence.