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PSU or Mobo? No display on screen... no beep .. fan works

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  • Power Supplies
  • Components
Last response: in Components
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August 22, 2009 7:35:29 AM

hey guys ,

i got this problem and searched all over the forums to find a solution but no luck

here it is

My desktop computer wont start its abt 2 years old... was always working fine.. then one day, after i ran all my antivirus for the day and deleted the virus, it stppped to work!!
.. its an Hp a1640n Core 2 Duo , 2 Gb ram, Integrated graph card
The problem is that i turn on the pc, the keyboard/screen lights on for like 1/2 a second then it lights off
I cannot hear any Beeps ( so no BIOS access or anything on the screen )
The fan works properly ( i can hear both of them and i can see them working ) and theres power runing the tower

I tried to remove the RAM, the Hard disk, Reset the BIOS, change RAMS ... no change at all

IMPORTANT NOTE: After 1 month of inactivity, my friend and i tried to turn it on and it worked ( perfectly but was stuck on the anti-virus so we restarted it
and the same problem occured after ) --->>> so i doubt its the Mobo cuz theres no way it would work once if it was fried



sooo.. is this a Mobo problem, or a power supply??
or could it be the power supply isnt well connected ( it worked once! so its not "broken" )

if a mobo is fried, thers no way it would have worked like all of the sudden ( 1 month of inactivity )... right??


if a mobo is broken, it is simply broken and cannot magicly be good again in 1 month ... but not the same wit hPSU?

More about : psu mobo display screen beep fan works

August 22, 2009 11:07:36 AM

I've had the same problem, where when my computer powers on, there would be no monitor display, nor any beeps. After swapping out many parts I have concluded that my motherboard was faulty (faulty RAM slots perhaps).

Hope that helps!
August 22, 2009 11:13:41 AM

Sounds like a Motherboard problem to me, has it been a victim for High temperatures since it workes properly?
Related resources
a b ) Power supply
August 22, 2009 12:51:03 PM

I also say most likely motherboard. Though if you have any add in cards like modem or sound card, remove them and try again. I have seen such things cause a system not to boot.
a c 144 ) Power supply
August 22, 2009 6:04:54 PM

No way of telling is it is the PSU or motherboard without substituting known good parts.
August 23, 2009 8:06:00 PM

can a mobo be burn but works after 1 month.. then stop to work again??

i thought mobos are made as if they crash, theeres no comeback ( have to buy a nnew one )
!