I recently helped out an ex-coworker who had just bought new memory for her computer (computer A) (Dell Dimension 4600) and asked me to install it. I have installed memory countless times never with a problem.
After installing the memory the computer no longer powered on at all. I tried unplugging everything except the Mobo still no power on, but when i unplugged the F-panel it booted right when i unplugged it, could never get that to repeat. I took the Power supply unit out of computer A and tried it on a second known working computer(computer
, Computer B no longer booted. I put a new known working PSU into computer A and it booted. her original computer had two sticks of 256k ram (sticks 1 and 2) she bought a new stick 512k(stick 3) when Sticks 1,2,3 are in it did not properly boot or show any signal to the monitor. sometimes it would beep once and the PSU fan would turn on and the CPU fan would turn on and the case fan would turn on, however no signal to the monitor. some times with Sticks 1 2 and 3 in it it gives several long beeps and no signal to the monitor. Assuming memory problem I took sticks 2 and 3 out. so only one of her original sticks were in. Booted fine three times in a row. however when I hit shutdown or restart the screen gets distorted with screwy lines all over and it freezes. With three successful restarts I put in ram stick 2 so now her computer has what it started with. this time boot up went normal until the windows splash screen where after about 5 seconds of seeing the splash screen screwy lines went across the screen and it froze up. sometimes with her original ram in (sticks 1 and 2) the front led lights won't come on but all the fans will, and no signal to the monitor, sometimes it will go screwy, sometimes it will boot up fine, sometimes the led light on front will just go orange. I tried the new stick of ram alone and it just seems random on whether it starts up or not or goes screwy. Tried with different known working ram (three different sticks) Stick one (starts up fine, shut down goes screwy) stick 2 ( goes screwy when windows splash screen appears) stick 3 no start up at all). Going to go run memtest86 on the computer for each individual stick of her ram.
The new memory is the same voltage and same speed.
Any help or suggestions are greatly appreciated.