[tonschk]

Hello , thank you all for the help , I removed the video card nVidia Sparkle 8800GT 512Mb Fanless heatpipe and after that I turn on the PC , the PC make a little bit "longer" single BEEP ,but the screen is fully continuosly black because this MARS Motherboard dont have the integrated video card , but the PC dont turn off automatically any more ,the PC is running continuosly "ON" , to turn off the PC,I must press the switch (on/off) just once , if I add the video card ,the computer start to turn off automatically just one second after this sentence is on the screen..... "PRESS TAB TO SHOW POST SCREEN , DEL TO ENTER SET UP"

1)...I cannot access to change the BIOS even if I press continuosly the TAB or DEL ,when the video card is installed the PC turn off automatically just one second after the sentence "PRESS TAB TO SHOW POST SCREEN , DEL TO ENTER SET UP " appeared on the screen

2)...the RAM is seated properly ( many times already checked)

3)....the extra power cable connector for the video card was properly seated ( before I removed the video card )

4) .....the extra power cable connector (8 pins) for the CPU is properly connected in addition to the 24 pins main connector

5)......This motherboard have nine holes that are upon nine brass standoffs ,properly screwed with only nine screws ,I dont think we need to add plastic whashers between the screws and the MOBO ,because somehow the nine screws must have metallic contact with the MOBO ( I think this is the correct way)

6)....I think the CPU cooler is properly installed because when I removed the video card the PC is running continuosly ( but show only black screen )

7).....I only connected to the MOBO one hard disk ,the optical DVD player , THREE RAMs , CPU cooler , and the video card . NO floppy ,NO sound card

thank you very much for your help