Engineers means? From which company? Are they qualified to do chiplevel Service of motherboards? Pls tell. Do you checked some basic thing's first to troubleshoot your problem?
No display means, no post screen? If so may be tables are corrupted in cmos. So remove the battery and leave it out for a while and then insert it back, if it works than use default parameters, set date and time etc, save it and than boot it. If other problem than check power supply voltages etc.