Advice Needed! Asus A7M266 & Win98 SE users

Good day to all,

Initial Condition: I started up the PC and began watching a VCD movie under Window Media Player.

Symptoms: After 15mins or so, the PC will automatically switch to standby mode. That is when leaving the mouse and keyboard untouched for 15mins. Thus I can't see any movies without having to press the keyboard or move the mouse every 15mins.

Symptoms of Standby:
After 15mins, the monitor blanks out, monitor Led flashing... . Sound still OK except slight distortion in sound when the monitor blanks out but after that it's ok. But viewing movies will be a problem.

Things I've tried:
I've set the power management options in Win98 to "Always on" under Power Scheme and "Never turn off" harddisks and monitors but same problem persists.

I went to the A7M266 BIOS setup and under the Power Option, I disabled the power saving mode and other hardware but no effect.

System:
Mainboard: ASUS A7M266 Bios Ver 1004
CPU : AMD 1GHz (266)
Graphics card: Asus 7100 Geforce2 MX400
Harddisk: Quantum fireball 30GB 7200rpm
Onboard sound
CDRom: Pioneer 16X DVD
CDRW: Aopen 12x10x32
Modem: Merz 56k
Scanner: Epson 640U
Speaker: Creative FPS2000
Monitor: 17" Samsung SyncMaster 753DF
PS: 300W ATX Casing
Operating System: Win98 SE

I would greatly appreciate if anyone can advise me.
Thanks in advance.

<P ID="edit"><FONT SIZE=-1><EM>Edited by shuiwu on 12/26/01 11:08 PM.</EM></FONT></P>