just bought a new mobo/cpu - wont boot up?

[poorlittlesparrow]

just bought a new asus mobo and a sempron 3000 cpu today to update my old system - installed it all and it wont fire up - when i press the power button the leds and the fans start up for about half a second then stop again - is this because i need a bigger psu? i have currently got a 350 and in the mobo instructions, it says that it should be ok with that but it aint!!
i have double checked all connections, tried unplugging the cdroms and extra hd so only the primary hd is connected and still no joy - any ideas?

[duffy90210]

Check your Mobo jumper, normally you need to change BIOS jumper first before the board will fire up.

HTH

[poorlittlesparrow]

anything in perticular im looking for? cant see anything amiss

[duffy90210]

Most board will have a jumper for BIOS reset when leaving the factory, and when its on, it will prevent the board from start up.

[ScotBlok]

just bought a new asus mobo and a sempron 3000 cpu today to update my old system - installed it all and it wont fire up - when i press the power button the leds and the fans start up for about half a second then stop again - is this because i need a bigger psu? i have currently got a 350 and in the mobo instructions, it says that it should be ok with that but it aint!!
i have double checked all connections, tried unplugging the cdroms and extra hd so only the primary hd is connected and still no joy - any ideas?

Sounds like a mobo problem. PSU is cutting out to stop any further damage. Duffy's right - there will be a reset CMOS jumper (usually down bottom right on an ASUS mobo - look for a jumper covering two out of three pins). A 5 second move from pins 1/2 to 2/3 clears the CMOS. 350W PSU is AOK for a sempron cpu.

It's possible that if it's a socket 754 board the BIOS isn't sempron ready and needs flashed (we've seen a number of boards with the 'Sempron ready' sticker on the box which don't actually recognise a sempron). Check the BIOS revision number on the ASUS website too.

All the best

M

[poorlittlesparrow]

have reset cmos and installed mobo again and still the same problem - winding me up now!!
do u think i have a dodgy mobo by any chance?

[ScotBlok]

It's possible - you'd need a guaranteed chip and RAM to do a second Mobo test. That's what we use when test benching possible failed mobo's.

Get your eye fixed 1st though! (See ya back on BST M8)

Mike

PM me tomorrow and I'll try and help you.