Grrr. OK-
In terms of this:
I was told by my IT guy at work to hold down the insert key while turning the machine on.
The guy was probably trying to accomplish one of two things by that suggestion:
1. On some (but not all) BIOSes you can force a reset by holding the Insert key down while the computer is turned off, and continuing to hold it while you turn the machine on and let it start the boot cycle.
2. Continuously holding a key down (or repeatedly pressing a key) as the computer boots will often force the BIOS to halt and cough up a keyboard error. You can often get in to the BIOS setup at this point.
A few standard things to try, assuming that you've already double-checked your cables/connections:
1. Remove, clean, and reinsert your RAM as helloimtim suggested.
2. If you have more than 1 RAM module installed, test the modules by installing each one individually and attempting to boot. If the computer fails to boot only when a certain RAM module is installed, replace that module.
3. Remove any PCI cards (network card, modem, sound card, etc.) one by one. Will the computer boot when one of those cards is not installed in the system?
4. Do the above steps for any CD, DVD, etc. drives.
5. Unplug the computer's power cord and remove the BIOS/CMOS battery from the motherboard. Leave it out for 30 minutes or more before reinstalling it. This will force a reset of the BIOS.