Computer wont boot all the time

[Signature818]

Guys I need help 🙁 1. My SEASONIC PSU 750w m12II keeps failing to power/boot the computer from time to time, sometimes the fan will just spin for a second then no power. 2. Brought the PSU to the vendor twice and tested okay with their test board. 3. Tested my computer again when I got home and it seems that it worked for a while then checked for the 12v rail and it dropped 9. something. 4. Turned off the computer and find out the the everytime I turn the PSU switch "off" my SSS has a ground but when I turn "ON" the PSU switch my SSD has no ground. Questions: 1. Does having a ground as you hold the SSD normal? 2. Does having a grounded SSD can be the cause of failing of 12v rail and for the computer not to boot? 3. Other than grounded SSD, is a grounded mother board (not sure yet) will be a factor for the computer to boot? Thank you so much for the inputs on this.

 

[Dashman9000]

Have you checked the outlet your plugging your computer into? Hot to ground on the receptacle measuring with a voltmeter should read in the low milli-volt range indicating your outlet ground is good. sounds like to me something is drawing down the 12 V. Try dis-connecting one part at the time like PCI cards, case fans and anything connected to the 12v line like a DVD burner, HD, etc...as best as you can while measuring the 12 volt line and see if you have one of those components drawing it down. Also look very carefully at all of the molex pins coming out of the power supply. Any corrosion on the metal pins could cause this and or if one of the pins in the connector itself isin't seated properly causing a power draw.