DOS PC build, no power at all. I am stumped.

digital x

Honorable
Mar 25, 2012
26
0
10,540
I have this http://www.ebay.co.uk/itm/COMPAQ-118053-001-SLOT-1-DESKPRO-EP-MOTHERBOARD-USED-/232125709628?hash=item360bc53d3c:g:MRUAAOSwcLxYEONw

A Pentium 3 CPU, and 256MB RAM.

Green light on the Motherboard and have tried the PWR header cable and motherboard cable only. I get a green light but the power button does nothing. I have tried the PWR cable in all pins, and each way around, no dice. New PSU as well, I don't know what to do.. Any ideas?

I have been gaming for a long time so PC's are not new to me, but this has me stumped.

Tried a different ram stick, in a different socket and nothing.

I've put it away now so any advice is good while I calm down haha.

Should note: I have no HDD yet, I have a CD ROM and Windows 98. The PC should start without right..? It's been a while since I used this old stuff. If I'm doing anything silly, wrong, let me know! Getting old.