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My system specs are:

  • Processor: Core 2 Duo
  • Motherboard: ASUS P5g41t-m LX
  • GPU: Nvidia 9500 GT
  • HDD1: WD 500 GB SATA
  • HDD2: WD 500 GB SATA
  • Optical drive: Samsung DVD RW
  • Power Supply: Some unbranded one that claims on its label it's 700W which I seriously doubt.

I have two operating systems, one in each 500 GB SATA hard disk and one of them is Windows 7 64 bits. I press F8 key on POST screen which gives boot drive selection menu from where I select the HDD to boot from.

The system was running flawless on both operating systems until recently. The problems are listed below:

  • Almost always it takes unusually long for POST screen to appear (around 60 to 90 seconds) whereas during good condition it used to appear within 5 to 10 seconds of power on
  • Sometimes the system doesn't receive display signal
  • If I take out power cables from all SATA drives but one, then the POST screen usually appears normally for sometime.
  • At one time I removed ALL SATA drives, i.e. both HDDs and DVD then turned on, it turned on promptly without delay. Then I connected Optical drive and turned on, it turned on properly. Then connected the HDDs one by one, and it still turned on without delay. But this lasted only for 2 days after which the same problem, i.e, either POST screen appears after painfully long time or doesn't appear at all

Before this motherboard, I had Intel DG43NB and had both operating systems and experienced exactly the same problem and my hardware guy told me that my motherboard had gone down so I replaced with this ASUS one. Again the same problem with this board

My questions:

  • Where is the problem?
  • Could the problem possibly be in the motherboard? I think it's unlikely because once the system starts it works flawlessly, i.e. no errors, no crashes, nothing.
  • Could it be the power supply? Since it seems to work better with less load, i.e. some drives disconnected.
  • Could it be the GPU?
  • What's the best way to diagnose?
  • Does the problem have anything to do with my frequently switching boot drive from POST startup menu?

Any help will be greatly appreciated since I am in the middle of an important project and I dread the day when I am not able to turn my machine on at all.


share|improve this question
Have you replaced the power supply? – Ramhound Oct 23 '12 at 15:26
Please note that we have a specific policy against answering Hackintosh-related questions. While I realise this question is specific to a BIOS problem, even before the OS loads, I recommend editing it to remove that reference. – user3463 Oct 23 '12 at 16:15
Do you have any USB devices like a printer plugged into the motherboard? – Brad Patton Oct 23 '12 at 17:46
I haven't replaced power supply yet. And yes I do have a wireless mouse, keyboard connected. Once I unplugged all USB devices but the problem remained. – LAAB Oct 24 '12 at 6:06
Slow post screens are probably a consequence of some possible issue with the video card - since it needs to initialise first and launch its own bios before the system bios does. – Journeyman Geek Oct 24 '12 at 6:07

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