System beep and screen flicker on boot

cheeni

Junior Member
Sep 23, 2008
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On boot up I hear a system beep when pressing any of Ctrl, ALT, Windows keys - the beep is accompanied by a flicker of the LCD screen where the screen turns black for a very brief moment.

Pressing the Shift and Windows key together results in a different kind of beep, much briefer like the beep has been strangled.

After this there is no further beep or flicker. So it's become a sort of habit to start up the computer, press ctrl a few times, and then windows and shift together, before I can use the computer.

I suspected a power issue, but power input seems normal. Maybe a dust issue?

Heating / Cooling shouldn't be a problem since the computer is just starting up.

A Symantec AV scan comes up clean.

I don't know much of the history of this computer or this error, since this is used by my father, and I only perform maintenance whenever I visit him.

Is there anything I am missing?

Thanks in advance!
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Configuration:

Mainboard : Asus K8S-MX
Chipset : SiS 760GX
Processor : AMD Sempron 2500+ @ 1400 MHz
Physical Memory : 512 MB (1 x 512 DDR-SDRAM )
Video Card : SiS 651_661FX_741_760_760GX_M661FX_M661MX_M741_M760_M760GX
Hard Disk : ST380817 (80 GB)
CD-Rom Drive : LG CD-RW CED-8081B
Network Card : Silicon Integrated Systems (SiS) Silicon Integrated Systems (SiS)
Network Card : Realtek Semiconductor RT8139 (A/B/C/810x/813x/C+) Fast Ethernet Adapter
Operating System : Microsoft Windows XP Professional 5.01.2600 Service Pack 2
DirectX : Version 9.0c