Acer Veriton M490G Hard Lockups at random.

I've been asked to help diagnose a a friend's PC which for months now has been
locking up at random without warning. It's a hard freeze (cursor stops
responding) and the only way to recover is to hold the power switch in for 5
seconds. The lockups are totally random, it could happen anywhere between 5
minutes and 5 hours of use or longer. There's no BSOD (So no dump file) or
anything untoward in the event viewer.

I'm totally stumped on this one. Here's what I've tried so far.

Virus scan. (PC is completely clean)
Windows Update. (Applied all important Updates)
Memtest. (Passed 4 cycles)
Checked PC Temps. (Temps were around 40c and fan was idling at only 1100RPM)
Checked PSU (Everything seems fine)
Disconnected non-essential peripherals (PC still freezes)

Below are the PC Specs:

Intel Core I5 750 2.66GHz
H57 Chipset Motherboard
4GB DDR3 RAM (3.5GB Usable)
1TB Western Digital Caviar Blue
Windows 7 Pro (32-Bit)

Does anyone have any ideas as to what the problem might be? Is there anything else I could try? I'm thinking motherboard fault, but I'm hoping it's something simpler than that.

2 answers Last reply
More about acer veriton m490g hard lockups random
  1. Are all of the non-Windows (the ones not supplied via Microsoft Update) drivers up to date? Prior to the random freezes had any new hardware or software been installed? I'm not sure but one of the Windows Updates could be the problem:
  2. I had much the same thing happening. After much research we discovered that the very substandard toy video card fitted by Acer (Nvidia GT220) was on the way out. Possibly caused over time because of the very undersized 300 Watt power supply fitted by Acer (we have 4 hard drives fitted.)
    An Acer authorised repairer is replacing the video card and we are paying a bit more to upgrade to a GTX660. They have also fitted a 500 watt PSU.

    Your issue may be related. Hope that helps. I didn't know a video card issue could cause the symptoms we had.
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