IBM

HI I HAVE A IBM CELERON 2.4 BLACK COVER SYSTEM, WELL WHEN I START IT, IT GIVES A POST TEST OKI THEN IT RETURNS TO THE MAIN SCREEN AUTOMATICALLY..AFTER I RESTARTED IT SAYING NO OPERATING SYSTEM FOUND, THEN I REPLACED MY HARD DISK AND THEN INSERTED MY WIN XP DISC WELL THE WEN THE DISC LOADS THE SCREEN IT BLANK FOR MORE THAN 5 HRS SHOWING NOTHING?

WELL I NEED HELP ON THIS MATTER SOME CAN HELP ME OUT? TO ME ITS THE MOTHERBOARD, WHAT DO YOU GUYS THINK?