Long story short: we had a power failure, and my wife’s system does not power up.<\/p>\n
System: Store bought, HP Pavilion 9400f, AMD Phenom X4 9750, 8GB RAM, 750GB HD.<\/p>\n
When power switch is pressed, absolutely nothing happens, no fans try to spin, no lights appear anywhere, nothing.<\/p>\n
HP docs on this system are not good.<\/p>\n
I pulled the covers and looked around. I see no obvious burns or signs of damage.<\/p>\n
Motherboard appears to be a MCP61PM-HM, HP P\/N 5189-4598. I think this is an Asus based mobo. It has a pretty standard and obvious layout.<\/p>\n
PSU part number is HP 5188-2589. It is 350W, but there is not a lot of hardware to drive in this system. And has worked unchanged for about 2-3 years.<\/p>\n
Further diagnostics: the PSU has an LED, which does show green when external power is applied. This seems suspicious to me. So I ….<\/p>\n
pulled the PSU, and ran standard bench tests. They are clean: 3.3 where expected, 5 where expected ,……<\/p>\n
I should mention: this mobo does not appear to have a single ‘power present’ LED. Either that or I am blind.<\/p>\n
I am looking for suggestions as to what to try next, because I am baffled at this point. I have the feeling that throwing a new PSU at this is not going to fix anything.<\/p>\n
Would appreciate any thoughts from folks more savvy about hardware than I am.<\/p>\n
Thanks, Guy<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"inline_featured_image":false,"iawp_total_views":22},"question-category":[47],"question_tags":[],"class_list":["post-12104","question","type-question","status-publish","hentry","question-category-hardware"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/question\/12104","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/question"}],"about":[{"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/types\/question"}],"author":[{"embeddable":true,"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/comments?post=12104"}],"wp:attachment":[{"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/media?parent=12104"}],"wp:term":[{"taxonomy":"question-category","embeddable":true,"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/question-category?post=12104"},{"taxonomy":"question_tags","embeddable":true,"href":"https:\/\/computing.net\/answers\/wp-json\/wp\/v2\/question_tags?post=12104"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}