I put new memory chips in my PC and the computer will not start up. It sounds like it is, then there is a beep and the screen remains blank. I tried putting in the old memory cards and nothing happens. What do I do?

I followed the proper procedures. However, there are 4 slots to seat the memory cards in and I dont recall which ones the original memory chips were in. i am assuming they were not the ones with the black lock down tabs and I will try the power up you suggested. I followed the proper procedures. However, there are 4 slots to seat the memory cards in and I dont recall which ones the original memory chips were in. i am assuming they were not the ones with the black lock down tabs and I will try the power up you suggested.

When you went to install those ram memory modules. Was the computer unplugged from power? Did you TOUCH the metal frame of the open computer case, BEFORE you reached inside your computer, AND BEFORE you took those new ram memory modules, out of their protective anti-Static bags? Are you certain the old ram memory modules are fully seated? Gold plated contact pins are all the way down in the ram slot, locks on the sides are snapped in place, the ram module's locating Notch, is lined up with the Locating Lug in the bottom of the ram slot. (Hey, I have seen people do it! Cram the ram module backwards in the ram slot. Ram module isn't even sitting all the way down, and the locks are open!) Computer off, and unplugged from power. Press the Power On button in, and hold it in. Hold it in for a count of FIVE seconds. Let go of the Power On button. Do this procedure Two more times. (Total of Three times) What you are doing is clearing CMOS Error Codes, and resetting BIOS Setup back to the factory default settings. Now plug the computer into power. WAIT 1 minute. Turn the computer on. When you went to install those ram memory modules. Was the computer unplugged from power? Did you TOUCH the metal frame of the open computer case, BEFORE you reached inside your computer, AND BEFORE you took those new ram memory modules, out of their protective anti-Static bags? Are you certain the old ram memory modules are fully seated? Gold plated contact pins are all the way down in the ram slot, locks on the sides are snapped in place, the ram module's locating Notch, is lined up with the Locating Lug in the bottom of the ram slot. (Hey, I have seen people do it! Cram the ram module backwards in the ram slot. Ram module isn't even sitting all the way down, and the locks are open!) Computer off, and unplugged from power. Press the Power On button in, and hold it in. Hold it in for a count of FIVE seconds. Let go of the Power On button. Do this procedure Two more times. (Total of Three times) What you are doing is clearing CMOS Error Codes, and resetting BIOS Setup back to the factory default settings. Now plug the computer into power. WAIT 1 minute. Turn the computer on.